MIDI events can be recorded from an external MIDI keyboard, connected with USB or the virtual keyboard. See An introduction to MIDI in Audio Evolution Mobile and Support for USB MIDI interfaces for more information on how to connect external MIDI equipment to your Android device.
Unlike for audio tracks, one first needs to create a MIDI track to be able to record MIDI. There are two types of MIDI tracks available as explained before:
To create a USB MIDI or instrument tracks, press the bottom-right 'plus sign' button…
… and select either of the two MIDI options:
After creating a MIDI instrument track, the Output selection dialog will pop up where you can choose which of the 16 channels you wish to assign an instrument to, which SoundFont to select instruments from (if you have more than one installed), a bank number and finally the actual instrument. Instruments can be divided into one or more banks, depending on the SoundFont. Drums are usually in bank 128:
Now with your track created, you need to arm the track first in order to record on it. Press the button with the red circle on it (you may need to switch mixer pages if you do not see it on smaller screen devices) to arm the track. If you do not have any external MIDI equipment connected, then a virtual keyboard will appear. When you now play your virtual or external MIDI keyboard, you should see the volume meters moving and if you created an instrument track, you should hear the instrument playing live. Now press Record and the MIDI events from the keyboard will be recorded. If you hear a long delay between pressing a note on your external MIDI keyboard and sound coming from your speakers, please see the section Performance limitations on this page: Support for USB MIDI interfaces.
After stopping the recording, you will see the recorded MIDI events in a new MIDI region:
If you are not satisfied with the entire recording, you can press Undo. If you have made one or more minor mistakes, you can open the Piano Roll editor to adjust or add some notes. You can record other MIDI regions on the same track at different starting points or create a new MIDI/instrument track and record on there. It is advised to record each instrument on a different track, because you can only select a virtual instrument per track. When using external MIDI gear, it is also advised to create separate tracks for each MIDI channel you are recording on.
If you want to continue recording using another instrument, first un-arm the track you just recorded and then create a new MIDI/instrument track. Select a different instrument in the instrument selection dialog if you created an instrument track, or choose a different MIDI channel on your outboard MIDI gear if you created a USB MIDI track. Then arm the new track again and start recording. The first track(s) you have recorded will play while you are recording the new track.
For recording drums on a virtual instrument track, please select Bank 128 in the instrument selection dialog. Bank 128 is always used for drum kits. The SoundFont that you can download for free within Audio Evolution Mobile contains several drum kits: standard, power, electronic, 808/909, jazz, etc. After selecting bank 128, choose the desired drum kit. When you now arm this track, playing the USB MIDI keyboard will play different drum sounds for each key. If you need a metronome, tap on the time indicator at the bottom, turn on Metronome and type or tap in a tempo.