Very impressive work.

For my 'On and Off' .tap I didn't even bother to try and get them to fit. Beeperman and Radio in the Rain are 32kb each !
I just had a multi-load .tap and assumed someone would make a .trd version

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in the 6502 world it performs very well. on the Z80 it should be good too....

The binary data is 16714 bytes large, 2768 bytes after packing with the apultra. You can try ZX5 on this data (attached).

freezing point:  94 841 bytes
ZX0: 12 659
APL: 12 351
ZX5: 9 019

Even with the best packing, I needed a large buffer for the largest unpacked song, it was nearly 19K. At this point it couldn't fit at all.

I had to:

- Place my code as low as #5b00, disabling the BASIC interrupt handler completely
- Overwrite the screen drawing code with the song buffer
- Decrease the two largest songs

In order to decrease the largest songs size, which happened to be Freezing Point and Geostorm, I first made a function that optimizes out the empty rows by reducing the speed of a row before (recursively, as long as row speeds allows). This optimization can be applied to any song in 1tracker now. This helped a bit, but still wasn't enough. So I also had to modify wtbeep and SquatM formats.

In the wtbeep, I now omit the 0 byte for rows without a drum (it is now triggered by the bit 6 of the control word). Saves a bit of room.

In the SquatM, I reworked the way how the dividers stored. Instead of the normal LSB/MSB order that is easy to read with POP I stored them in the MSB/LSB order, and used bit 7 of the MSB as the note rest flag. The LSB is omited for note rests. This of course made the song data parser very suboptimal, but the Sqeeker-like design does not suffer from row transition noise much, and I gained the remaining bits of the RAM.

The largest songs remained the same, but I saved a couple K this way. Freezing point is 16714 now, and Geostorm is 15809 (2768 and 2500 packed).

Interestingly, both Geostorm and High Orbit started as NES tracks, they were half finished sketches (half length of the finished versions) written for a game that never happened, lying around since 2017 I think. I thought they won't translate into 1-bit well, because the NES of course used volumes, duty cycle, slow attacks, samples, and so on. But it turned out to be the case when moving a song sketch that is just stalled in one format into another format made it shine.

My favs are Geostorm closely followed by High Orbit