Move loops between your computer and the stem player, as WAV or MP3.
Not connected
Use Chrome or Edge on a computer, with the SP-1 plugged in over USB and powered on
normally (not playing). Click Connect and pick the SP-1 Audio serial port. No button combo
or special mode is needed — the looper switches itself into transfer mode the moment you
select that port (it pauses and the four track lights blink together). Uploaded clips are
resampled to the device’s rate, mono; every track keeps its own length and loops
independently (the first clip in a song also sets its beat grid).
Backup & restore
Download all saves every track as a WAV named by its place —
sp1_song3_track2.wav.
Upload many takes any batch of files named that way and puts each back in its
song and track. Together they're the round trip for moving your loops to a
fresh or reformatted device.
Device settings
Admin — test tools
Unlisted (you found #admin). Erase clears every song from the index and the
saved beat grids; audio blocks stay behind but unreachable. Device settings
survive. This is the "factory fresh" state for testing backup & restore.