> Besides these standard kinds of keyboards, there are the USB-based > keyboards like from Evolution and M Audio which I have just looked at > online. These have no voices or anything, but are used strictly to > send MIDI messages and control various pieces of software. These seem > neat, but the first question I have is can they work with BeOS? All these USB devices did are sending MIDI events over USB bus. When we'll have a usb_midi drivers supporting also the whole propriery-but- standard-in-fact USB MIDI devices outhere, you should be able to use them too. There a userland USB MIDI driver on BeBits, maybe it can works already. > > On that note, what kind of support is there for the standard keyboards > like the Yamahas mentioned above? I suppose this depends on the sound > card driver? Totally. MIDI use a derived serial interface. While MIDI events can be read (and write) from your MIDI port by BeOS, any MIDI devices will works with any BeOS MIDI Kit softwares. Last advice : having a pitch bend control is a plus usefull to stress a MIDI soft synth... sensitive keyboard are a must, but an expensive one. -Philippe.