The Sequencer contain a fine degree of steps (one quarter note contains 24 micro steps) to get very intricate rhythms going making it less good for direct programming but very good for the discerning musician that needs the rhythms just right.
The sequencer is not the main course though as the app is more for having rhythms already made with variations to switch things up with during practice sessions.
Yes there is a bunch of these apps out there but this one comes with three things to make it stick out from the crowd.
First being is that the samples comes round robin (playing slightly different versions of the samples at each hit) This as far as I know does not exist for any sampler at all for Android.
The second thing is something that I wish was a function built into more apps and that is a humanize function so you can decide how erratic the hits will be as no human can play in perfect beat this in combination with round robin adds to humanize the rhythm if you want.
The third is that you can use a footswitch with a USB-OTG cable to switch in between fills, intro etc while playing a instrument.
The most basic one is for free which is a good thing especially if you are thinking to use it for programming rhythms as the programming of rhythms can be slightly tedious (it is not that bad but there is a lot of people that have no patience). One thing that could be good to implement would be to have the "micro" (ticks) steps in between collapsible that you have in SunVox and in other trackers making it easy to program the main rhythm and then add smaller additions. Otherwise if there is only a need to have rhythms to practice to there is not anything negative to say about the application.
Maybe it would be good if you could import midi files.
Actually it could be hard to work into the same app as it is set up but maybe... I am not a programmer and have learnt what seems to be obvious and simple to a non programmer...
is often not the case.
But definitely worth checking out if you need a drummer / rhythms for your practice sessions in either case.
So to check out what the different versions have to offer:
Drum Machine Drummer Friend Free
Drummer Friend - Drum Machine
Drummer Friend HD Drum Machine
In the first video he is switching the rhythm by hand this is not necessary if you have a foot switch. Which is one of the selling points of the app. But I think the video is before this was implemented.
In the second video he has hooked up a audio receiver to his computer that records the audio through Bluetooth. I did not know that this was possible until the developer told me and that this is possible for almost any (or all) Android devices...
Learning some basic facts about Android every day....