Turn Old Into New!
First of all, using the MD-BT01 with a digital piano allows you to wirelessly connect an older model to a music computer, e.g. for MIDI recording, notation, etc. Connecting to a piano app is no less exciting – it lets you benefit from the technically superior sounds of apps such as Pianoteq 8 or Pure Piano.
However, this only makes sense for digital pianos or keyboards that have MIDI ports but do not support USB. Used stage or hybrid pianos with high-quality keyboards are available at very reasonable prices, but can’t even compete with current entry-level digital pianos in terms of sound.