Calling non-ZXB code with RANDOMIZE USR

[LTee]

I see. So I'd need to alter the routine to push IX before it begins and pop it again as it ends. I surmise I'd have to do that within the music routine itself and couldn't somehow do it using an ASM block within the BASIC?

I might go back to trying to get the assembly versions of the Beepola output to work, tweaking the binary output is going to be overly complicated by the looks of it. Or I might just write some tunes using normal BEEP commands. :-D

Thanks for explaining that, boriel!