I have no experience with midi but i have two devices (alesis v49 and akai pro mpk25) in total 74 key so is it possible to combine these to two midi work as one device to cover most of piano key ?
It depends on your software and there might be some tricky configuration, but the short answer is yes. For example, you can definitely do this in Apple Mainstage and Ableton Live.
There are possibly at least a couple ways to do this,
- Transpose the Akai Pro MPK25 up using the octave key so that it will play the registers that the (untransposed) Alesis is currently playing
- Transpose the Akai Pro in your software DAW, again by whatever amount of octaves it takes to allow the Akai Pro to play the registers that the Alesis isn't
For instance Alesis will play from C1 to C5 and Akai C# upwards