Image-line and it is a controller specifically made for FL Studio.
It does allow you to use up to fifteen devices so guess you should go out
and buy some more Android devices to feel like you are in full control!
It seems to work great according to the first reviews...
Here is what is said on the Playstore page:
------------------------------------------------------------------------------------------------------------------------------------
Image-Line Remote ( IL Remote ) is a free Tablet or Phone, user-configurable virtual MIDI controller application for FL Studio and plugins. Just open FL Studio on your computer and IL Remote on your android device and the connection is made automatically over a Wi-Fi network. NOTE: REQUIRES FL STUDIO 11.0.4 OR LATER Control FL Studio instantly or link your favorite instrument and effect plugins just as you can with any MIDI controller. Use a phone, tablet or any combination with up to 15 devices simultaneously.
Use the included controller tabs covering functions including; Transport Controls, MIDI Keyboard, FPC control, Harmonizer Keyboard, Performance Mode (Clip Launcher), Gross Beat FX, Mixer and more. If the control you want is not available then you can create your own.
IL Remote allows you to add custom tabs and add controls including Pads, Faders, Knobs, Jog Wheels, Mixer, Clip Launcher, X/Y Controls, Piano Keyboard, Harmonic Grid and Containers. There is a complete range of customization options for each control so that you can create virtually any virtual MIDI controller to suit your needs.
For more details check the online manual here:
http://support.image-line.com/redirect/ILRemoteManual
User forums:
http://support.image-line.com/redirect/ILRemote_Users_Forum
Video Playlist:
http://www.youtube.com/playlist?list=PLkYsB0Ki9lAdBPjGpa0vEH8PLT5CSoy8L
Enjoy!
-----------------------------------------------------------------------------------------------------------------------------------
Playstore link:
Image-line Remote