I don't know if you're joking:
The serious answer is the beeper is a very basic 2 channel sound generator. The only guys who made decent digi effects on the 48k were Tim Follin (AgentX, LED Storm), David Whittaker (Dizzy) and Jonathan Smith (Firefly, Mikie). You also don't have enough memory to store a giant sample in memory. If you want a beeper version of the tunes you'd have to get the notation and input that in a chip tracker and use a sound driver to replay the tune. Melbourne House Music Box 48k isn't that good. Voice and SFX sampling was very low frequency, low bit rate.
You might want to ask these guys:https://www.worldofspectrum.org/forums/
If you wanted to make a sample demo you could do that fine on an ST! 8-11kHz 8-bit sampling. Clearer replay on STE. There are many examples of good sample demos on the ST\STE.
Still got, still working: Atari 4Mb STe, 520STFM, 2.5Mb STF.
Hardware: Cumana CSA 354, Ultimate Ripper, Blitz Turbo, Synchro Express II (US and UK Versions).