Is there anyway to make custom waves for DPCM?

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Is there anyway to make custom waves for DPCM?
by on (#23806)
Is there any way to make even symetrical waves into a DMC file?

Kind of like simulating channel 3 on GBS format?

by on (#23834)
Clean looping is hard to do in DPCM. But for one-shot waves, you can use the DPCM encoder and decoder on my NES page.