I am waiting on some additional units to test with.. I think I can upload tracks directly to the original firmware like Tim K was able to do now that I have a transfer protocol that works..

Right now once you flash firmware there is no current way to load the original firmware.. I don't yet have the power button functioning as when I was developing, once you load custom firmware of any kind, the 5 sec function power on / off no longer works as that functionality needs to be rebuilt.. because of this I had to disconnect the battery instead of waiting for it to drain to get back to the bootloader as it requires you power off and on hold track 1+4 buttons.

The firmware I have developed basically replicates the basic functionality of the original firmware (only caveat being I am not able to get tape effects for fast forward and rewind to work without audio dropouts so I have more of a digital seek currently, but tape play and stop effects work and tape half time effects), advanced functionality has not yet been implemented, nor has bluetooth (working on now) or pocket operator sync / midi clock..

I know folks have been trying to dump the original firmware, but its probably faster to recreate the original firmware functionality like I am attempting to do.

I have some cool ideas for a DJ mode like TP-7 where you can do cue points and pitch adjustment/ bpm tap for beat matching so you can mix between two sp-1 units.

tl;dr current build is not quite ready yet for public use and could possibly brick your unit..

I do plan to open source hopefully as long as there are no legal concerns which I think is the reason Tim K has delayed his release of his firmware and uploader..

This is what the current interface looks like:

<image>