Micro maestro?

J P Mcgowan
Huddersfield,
West Yorkshire
from Your Computer, August 1982, page 85

This program produces "music" on your ZX-81. I am not absolutely sure how it 
works, but when the computer changes from fast mode to slow and vice versa, it 
makes a click in the cassette output port. If an amplifier is attached the
oscillations can be heard. If you are without an amplifier you could use a tape
recorder to tape it and then play it back.

For a lower note you can add the following lines:

	15 REM
	25 REM

Here is the main program listing:

	10 FAST
	20 SLOW
	30 RUN

