How do you use Raspberry Pi without a keyboard that happens to have a 'program' button?

I have a few midi keyboards and midi music devices, but none have that button, so I can't cycle to the next instrument (the only instrument on the SD card) and just have the default saw wave.

Is there any way to use this software on Pi without a keyboard like this? Is there even like a (qwerty) keyboard button that you can plug in to get to the next instrument?

(This seems like a huge oversight by the developers on what is really awesome software. Why just not make it easy/possible for users to add a folder to the main boot microSD and put a line of code that directs the software to check for that folder first to load, then if not present to load the default?

I think you have to create a folder called "0 something" to an USB-stick with you samples in it. so the samplebox takes the samples from there and do not take the saw samples.

I think you have to create a folder called "0 something" to an USB-stick with you samples in it. so the samplebox takes the samples from there and do not take the saw samples.

No that doesn't work. It just loads the saw

No that doesn't work. It just loads the saw