How to slice a sample into many 256 samples length sections?

Is it possible to set up the renoise waveform editor to slice a sample every 256 samples?

Its so I can cut up this sample (which is many 256 samples length waveforms end to end in one .wav)

Should be pretty easy to script I think.

Good idea but I still dont know how to script so I think ill just cut it chunk by chunk.