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P is 'pitch'. It is not really pitch per se, more like a filter of sorts, makes the sample sound more and more muffled. On some samples it actually feels like a slight pitch change, though. O is sample offset, a sample can be played not just from beginning, but starting from a later point, it helps to get more dynamics with the same sample.

RLA gets the topmost bit into the Carry after a logic operation XOR/OR/AND that normally does not affect Carry. Honestly, I forgot that I ever invented this method (perhaps borrowed it from you?).

Oh yeah, dithering applied to the 1-bit sound synthesis may bring some quite interesting results! Cool idea, never thought about that.

I still can't get rid of suspicion that AngelScript just does not happen to be very stable. Especially between platforms. Too bad it is too late to switch to something, and, well, back then I picked it because it shown very good speed among other script engines, plus it had C-similar syntax. These days Python would be a better bet, I guess, but alas.

Wow. Maybe I'll just rework all the engines and interfaces to avoid the use of uint altogether, so it'll be int all around? I wasn't ever getting any segfaults or crashes under Windows, though.

Oh yeah, loopRow seem to be uninitialized in one of the branches in many engines. Damnit the mindless copy paste of seemingly working framework.

Assembler is intended to be called only once (function ZXStandartExportOptions in zxspectrum.1tl), but the assembler itself is a multi pass, not a single pass one.

Named the second idea ModPhase, implemented both ideas as experimental sub-engines inside the Ear Shaver EX engine - because it blends pretty well with the design.

And if we just drop xor N right before cp d, it gives a quite interesting modulation control!

Just come up with a dumb, but more controllable and thus usable PWM-like modulation idea:

    ld hl,0
    ld bc,100
    exx
    ld hl,0
    ld bc,201
    
loop

    add hl,bc
    ld a,h
    exx
    add hl,bc
    cp h
    exx
    sbc a,a
    and 16
    out (#fe),a

    jp loop

bc=100, bc'=100+detune is the regular PWM like drift, bc=100, bc'=bc*2+detune is one with octave etc, bc'=bc*4+detune is another octave, etc. Other not related values is kinda Earth Shaker'y, but not so much, a different kind of the sound.

Edit: I tested it out, and it actually matches exactly to Phaser1 in the resulting sound for any given adders I thought to test. Interesting.

Re-Edit: Nah, I messed up the previous test (was testing it inside Ear Shaver EX framework, and used a wrong pointer). It is really different both from EarthShaker and Phaser1! Hence giving this potential engine a name of CrossPhase, will add it as an Ear Shaver EX's update for now.

I guess that's because there are too few people in the voting - about 50 total (offline/online), and half of them voting at the place, on pieces of paper, and some of them are not really understand what they're doing (people came here with their families), so it is easy to make mistakes.

One problem is that number of votes is different per each entry, some people chose not to vote for particular entries, and authors generally not voting for their own entries. So if I would vote for my own entry, I'd likely get 2nd with that tiny margin, hehe. As for lqm, I don't really know what it is.

The results:

[ ZX Spectrum Beeper Music ]

1.   7.61   A Strange Game by utz ^ irrlicht project
2.   7.18   Synthetic Heartbeat by Ataritufty ^ 1bit Forum
3.   7.17   Noise In My Head by Shiru
4.   7.14   Cosmic_Puppy by AER
5.   7.06   Traffic Lights by Shiru
6.   6.04   Yo Yo Beep Beep by Ataritufty ^ 1bit Forum
7.   4.33   SAD Beeper by rnR T.A.D. 7E6 ^ s'ky killer's

Yep, both of my tracks are Ear Shaver EX, and a few more to come sometime soon. I was trying to explore the possibilities of this particular engine and the potential of the whole engine-per-row approach. It is really promising indeed, although I'm thinking to EX it a bit more.

Totally, the strongest compo in years.

Yes, online voting is still open, results tommorow: https://events.retroscene.org/dh2023/beeper

A regular VIC-20 sound chip sound is heard in some demoscene productions. The chip is actually interesting to explore, as it is capable to produce not just square wave, but bit patterns. I've tried to exploit this trick in the PETSCII Robots driver, but it didn't turn good enough. There is a lot to be explored. A glimpse of this is heard in the video linked by utz.

As for 1-bit stuff on VIC-20. Well, it is 6522 then, so exactly the same thing as the stuff that I did for the PET.

A spoiler: a native PET PeskySound-driven editor has been put into the queue of projects some time back. Should be portable to the whole 6522-equipped Commodore range easily enough.