We now have a new export function in MSX BLOAD tape format, (EDIT: BLOAD on the ZX80/ZX81 now works !), as well as the ZX Spectrum and Philips VG stuff.
The sound library is now primairly referring to the common sources.
The local exceptions include a nice 4bit samples player based on the GS Tools' format for the Commodore 128 SID chip.
Most of the code works on the Lambda clones as well, but the sound is sent to the tape port, not to the sound port.
On the EightyOne Emulator you can open the "WAV loader" tool, enable the speaker output and press "record" (as you did in the old days with the "monitor" switch on the family radioecorder !)