Interesting app for learning piano theory with some great extra features as being able to use it as a midi piano controller for your DAW over wifi and a simple synthesizer built in...
The website i sworth checking out for additional information...

Google Play
https://play.google.com/store/apps/details?id=com.mixtics.sevenpad&pageId=107817317434258015023

7Pad is a 49 (7*7) chord pads instrument and a virtual piano to play, learn and compose music with harmony, you can input your own usb midi keyboard and integrate it with your actual home studio with the midi output over wifi.
Features 
Virtual piano, play scales with color hint (each degree has a coresponding color) and an option to disable sound for the notes out of the selected scale.
12 chord scales, 49 chord pads switchable in realtime.21 piano solo scales.
Arpeggio mode, it's always good playing piano solo with only the notes of the current palyed chord, no mistakes !
32 internal DX7 like soundswith changing filter parameters : cut-off, resonance and overdrive.
Changing the set of play parameters in real time : 5 octaves with velocity and 24 voicings for every chord type.
Metronome and tempo can be changed to control the built-in arpeggiator : 4 modes, 3 speeds and 4 rhythmic variations playable live or with the song AutoPlay mode.

Contrôle via USB MIDI IN with your instrument connected to the Android device, you can play chords and scales directly from your midi controller instrument with visual feedback on the virtual piano.
Midi over Wifi function : Allows you to play an external instrument (VST) controlled playing 7Pad thru a midi over wifi connection to your VST host.

Learning Music : 
Structure of 12 scales, playing all chords from scale in a chosen tone, the app suggest the next chord to play within a Major or minor scale.
Visualization and ear training in the construction of chords: notes, roles and octaves : you can listen to the notes separately by pressing each one.
Viewing piano chords and scales: Real-time display of the chord played on the pad and its reversals on the piano, colored scales to see what you can play.
Tone and corresponding armor, harmonization (construction and set of harmonic sequences), circle of fifths, control of voicings and modulations.

Arrangement : 
6 chord types classified by the type of triad: Major, minor, augmented, diminished, suspended or 7th.
49 chords directly accessible from the 7pad with recordable configuration of "pad-sets"
In "Chord" mode : automatic proposal of the same type chords plus all chords "On Bass" available for storing in custom pad-sets.
In "Song" mode : easy chord grids edition and saving parameter set with each chord, parameters of the sound and the arpeggiator. allowing you to record an inspiration everywhere and restart later with same parameters, before finalizing the master in your favorite DAW.
chord, parameters of the sound and the arpeggiator. allowing you to record an inspiration everywhere and restart later with same parameters, before finalizing the master in your favorite DAW.Social : 

YouTube: https://www.youtube.com/channel/UC7DpMsg2Zrfy2Ed9TpVLO-Q
Soundcloud : https://soundcloud.com/user-58065110
Infos and Faq: http://www.sevenpad-music-app.top
Twitter : https://twitter.com/mixticninja
Google+: https://plus.google.com/u/0/collection/YD1qZB

Legal information: 
http://www.sevenpad-music-app.top/legal.html

WHAT'S NEW
​* Exclusive Arpeggio scale mode : Always good arpeggio based piano play with any chord played by 7pad.
* Added 21 scales to play and learn with the virtual piano or a usb midi real one
Piano strip view : note name displayed when touch played.
Current scale is now saved and restored with each song / padset.
ModWheel and PitchBend from usb controller are now sent to midi, new program change buttons.
* : Premium options

​So did this interview after hearing the album "Russian Love" made with SunVox which I think is excellent and got curious about the artist. In the end of the interview it is possible to download the SunVox file for one of the tracks which is pretty exciting to see and hear  up-close what is going on.
There is also an earlier track of his from the early nineties that can be fun to hear how things have changed.
Plus the possibilities to buy  a four CD collection of earlier works...

What I understand is that you went to musical school  in the end of the eighties. What did you study there?

I actually didn't go to musical school in the late 80s, but I went to a university and I studied music aesthetics there, the philosophical aspect of music and art.

How did you get into electronic music?

When I was 14 or so, I met some music of KITARO and YMO, and was attracted by their electronic sound and hypnotizing atmosphere. later on I knew KRAFTWERK, it made me crazy, and next Brian Eno, bla bla bla... 

In the beginning what kind of equipment did you use?

I started making music with a small YAMAHA keyboard PS-3 and compact effects when I was 15. And I got my first synth Roland JX-8P when I was 19. At that time I was also using 80's digital/analog stuff such as TR-505, DEP-5, TX-81z, and a TASCAM multitrack cassette recorder.

What was the first software?

MuLab 3. I had been using hardware for long time, and got involved in the software world very lately.

Do you play any instruments?

Keyboards, and sometimes percussion.

How does that affect your composing and production?

I think many keyboard players are likely to be very chromatic, but I feel sometimes I need to get out of it. I was very lucky because I didn't became very good at playing keyboards in spite of 6 years education of playing the piano. I was very lazy and not so motivated to play instruments when I was a kid. 

I understand that you was a DJ already back in the nineties how was the scene in Japan/Kyoto at that time?

At that time I was in Tokyo, that is a huge city and it has many groups of any kind of music. It is hard to know all of them. I think in the nineties there were many small groups of hard techno, drum'n bass, house, electronica, etc. By myself I was doing electronica, ambient, click and dub techno etc. using cds / groove box. And I also played classical music in techno parties as well.

Are you still DJ’ing?

I seldom DJ for parties recently, once or twice a year. Usually I do that just for myself or close friends in small parties.

How do you feel that the scene changed over the years where you live?

I think the club scene here itself became much smaller, because people do not spend their time in clubs any more. But some people still like to be in clubs, and they enjoy parties. I think club music is not so cool for many people any more, but it became a part of our usual lives.

How are the contact internationally and are there any collaboration with artists from other countries?

Japan is geometrically isolated and sometimes we feel difficulties in language, but some artists do international activities via internet.
For example, my music was released from some labels in other countries like Germany, US, etc., and remixed by other artists. I am also interested in artists abroad to release their music from my label.

Are you using SunVox exclusively nowadays?

Not exclusively, but I use it mainly. 

What other software/equipment do you use?

Mulab 5 to use other VST instruments / effects.
Studio One 2 for mastering / editing.

How did you get to know SunVox?

When I was looking for new tools to make music some years ago, I happened to meet a guy who showed me some tracker-type software. I was fascinated and tried to use some of them, and I came to like SunVox the most.

For the readers how would you describe the advantages of a tracker interface to the more common piano roll interface?

I think piano roll is too much like music score, and it reminds you the academic way of making music. And when you use it, your brain automatically tries to figure out how the melodies are like. Sometimes it is annoying because you have to see the eternal chromatic scale there, and your brain might get tired seeing it.
In case of a tracker, it looks like a program, not like music score at all. If you have an allergy to music score, as your music teacher in your infant time was mean, it is good for you a tracker does not remind that experience. You just can get into how the music sounds, and can edit it as you correct word sentences.

What is the most common instruments and effects you use in SunVox?

Definitely Echo.

And what instruments /effects makes you most confused?

To me SpectraVoice is kind of complicating and I can't expect how it sounds when editing, but I like it anyway.

What is your favorite trick/s in SunVox?

1C Cut note
20 Note probability 

The album russian love, did that get mixed and mastered in SunVox?

It was mixed in SunVox, and mastered in Studio One 2.
I usually record songs via line out of the audio interface in real time, and give the recorded file back to my PC via usb cable, and master the file in PC.

Is there any other musicians that you know that use SunVox?

I sometimes recommend it to my friends, and I think some of them are trying to use it.
But I don't think it's very famous here compared to other tools like Ableton Live or Reason.

Can you talk a Little bit of your record label Easy + Nice?

I founded "Easy + Nice" last year to introduce any kind of interesting alternative music. It treats electronic, ambient, world, dance, field recordings, and other experiments. I try to make it experimental and cozy at the same time.

The symbol for the label looks occult. Is magick something you are interested in?

You noticed that...
It was made with sigil, that is the only magick I can use consciously. 
I am not interested in magick a lot, but this time I used it, as I didn't think of other ways to make symbols.
 
And what does the sigil stand for?

an easy and nice life.

What is your future plan for the record label and your private music?

Basically same. I have released one album every month for the first several months since the label started, but now, as 5 albums have been released, I think I can make the pace slower.

Recently I am making techno for myself, and some music for movies.

Any last words?

Life is the sense of continuing, and the gradual / sudden change bring it. Music is the way to make it.

Thank you for reading this interview, and if you get interested in my activities, please visit Easy and Nice web page and my youtube channel.

https://easyandnice.bandcamp.com/

https://www.youtube.com/channel/UC5fZDjPUmQeEP14COqba74g

loveburger.jp

There is also a collection of four CD's that can be ordered and here is what is said about it:

This 4CD box contains 3 CD's of the earlier work of Waki over the period 1995-2004. "Take you to the bottom" (1995), "Shuku" (2002) and "Life and space" (2003) were only released in Japan. The last CD "Special" is a bonus disc. The four CD's came along in a nice orange handbag.

https://www.discogs.com/es/Waki-Special-4cd-box/release/580087

The review on iOS but being the same for Android outside of connecting with other apps.

Waki made a very nice album that got released earlier this year using SunVox. 
I have done an interview with him that will be published this weekend but first it could be nice to post these videos that he made. He does them in japanese with subtitles and they are very nice as he have a very soothing voice and brings some insights to the table that may instigate some inspiration.
So there is two videos talking about modules and one regarding the album he made.
To finish off there is two sets of Techno using SunVox.

To read more go to:
http://www.journal.deviantdev.com/sample-libpd-android-studio/

Pay attention glitch addicts! 
This video show a "secret" feature of SunVox. Before this website I did discover this and was very happy as I thought it was very cool (which it is)  and have hunted more secret easter eggs ever since. 

Robin that have been helping Musical Android out some times lately made me aware that Jasuto was now just about a Euro/Dollar (about two weeks ago and being full up mentally I thought that I mentioned it but alas no!). So this is definitevely one of the more interesting apps on Android for anyone that likes possibilities and depth.
My guess is that the price is lowered as the developer is indisposed for a indefinite time and so can not support the application. It seems that some people have problems with the microphone input for example but would say that even if there is some things that do not work properly it is totally worth it as even a fifth of what the app can do is worth much more.

Google Play:
https://play.google.com/store/apps/details?id=com.jasuto.droid&hl=en

So to try the new Beta you need FL Studio and sign up. Otherwise it is nice to see what is coming independent if you have FL Studio or not. And as said before it is going to be a free update so that is great news if your device can handle it.
To sign up:
http://www.image-line.com/documents/news.php?entry_id=1467949082

These are two demos going through Imaginando DRC synth. They are not on Android but as it works the same on all platforms it is still valid. (With the exception of Ableton link that works on iOS...)

Saw this the other week and it is pretty nice. Unfortunately on my smaller screen it does not show properly but is still usable so that could be just my device or it is better to use a tablet for it. In either case have a lot of possibilities for sound design and is for free without publicity.

Google Play:
https://play.google.com/store/apps/details?id=com.studio6plus1.involve&hl=es

Welcome to Involve.
Involve is a monophonic synthesiser designed to be played as a real time instrument. With an emphasis on real time control using faders, this gives an advantage over the usual virtal knob in that where the device is touched is the control being adjusted. All of the parameters can be assigned to the accelerometer to utilise movement as a form of control.Multi module
Involve has been designed to be more than just a single synth, It is a collection of synth modules utilising common core code, ui and control. At present there are two modules, A single oscillator virtual analogue synth with delay, And Super Sawer, a 5 union oscillator with sub generator for them large phat sounds.
There are currently more modules under development. Being an open source project, we welcome suggestions and pull requests.
github.com/curlymorphic/involve

Update2 New Synth modules, Segment, and Mini Segment Synth
Improved limiter
Improved Menu
Controls now indicate if connected to the accelerometer
Double clicking on a accelerometer control, unbinds the control.

What the phuck I should not really post this but in these times when hate seem to be creepy crawling its way into a lot of peoples hearts hopefully this will give some people time to reflect and change to the better?  It starts out as a piece of one scary dude but see it through to the end and see that it is much more universal knowledge being imparted than suspected. So please just watch it through...

So now there is a Beta available to use inside FL Studio as a plugin for anyone that own it.
The idea is that the projects that you make in Fl Studio Mobile are totally interchangeable with the plugin making the mobile app very desirable for FL Studio owners. Happy to report that the new version 3 are according to official sources going to be a free upgrade...

Here is what is said on their website about the Beta:

Welcome to the FL Studio Mobile 3 FL Studio Plugin.

You can now test the FL Studio FL Native version of FL Studio Mobile as a plugin. This is how we aim to allow users to work to and from the mobile version. In future we will enable 16-channel audio output from the plugin and allow drag-n-drop of MIDI / Audio data between the two.

The plan: The FL Studio Plugin version will be included Free to all FL Studio users of FL Studio Producer Edition (and up). As usual, we reserve the right to change these terms. So if you own FL Studio Mobile and register it to your IL account prior to a change-of-mind on our part, you will continue to own the FL Plugin version should we decide to sell it as an add-on purchase (for which we have no plan at the moment). Put simply: Everyone using producer edition and up, gets this plugin for free. Registering your mobile version to your IL account will guarantee it stays that way for you.

To get the Beta go here:
http://forum.image-line.com/viewtopic.php?f=100&t=159176

If following the KVR Forum someone have created an application to make some things easier.
It is not yet on Google Play but it is possible to download the APK from here for now and to read some more about the app:
http://www.kvraudio.com/forum/viewtopic.php?f=166&t=389185