Midiroid is an Android Midi Keyboard which communicates via home Wifi to a Windows PC for playing VST Midi instruments though its free sister app for Windows.
The files for the Windows app are here:
To make the windows app work you require three things:
A Midi driver: https://www.tobias-erichsen.de/software/loopmidi.html
A VST host application try CantabileLite: https://www.cantabilesoftware.com/download/
Some VST Instruments: http://www.vst4free.com/index.php?m=VSTi
Multiple Midiroids can be played on the same PC over a home Wifi network all you have to do is unzip the windows app into a new folder and run it along side. Simply choose a different Midi port and Wifi port for each VST Instrument then a band can play at once or a one person band can play via the sequences.
The dots on the left hand side are to record sequences of keys that you press, the dark YaY logo saves the loop and the corresponding play triangle will then play it. The bright YaY logo stops the loops and any keys playing.