The changes are quite light but I fear it messed up the timing a little bit. The output on ZX spectrum is done using
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out (#fe), a
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and #08
or #20
ld (0xe007), a
Anyway, the archive contains the tape and the modified source file.
Here's a short video of the music playing on my Sharp MZ720.
https://www.youtube.com/watch?v=mOC-X9ich1o