You really don't have any idea what's the issue here, do you? What you are talking about is streaming, for which ADPCM support exists in software (but everything is doable in software given enough power, so that's essentially meaningless) so the recording takes up less space on the disk. Hardware support for compressed samples however is necessary to fit more samples in the limited sound RAM, if there isn't any less amount of sound data fits into the same RAM limiting the variety of sounds possible within a given sequenced piece. This is the case with the SCSP/YMF292.
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