new engine: pytha

Whoops, just noticed that I miscalculated the timing, 220 cycles instead of 224. Got a version which runs in 216, but the improvement to the sound is barely noticable so I'll leave the engine as it is for the time being.

Lots of HF noise, the border stripes visualize the noise.  Does masking the border bits add much time to the routine?

Ok, here's a hardware recording: http://irrlichtproject.de/transfer/pytha-demo.mp3
Could be cleaner, yes, but still it's nothing a little equalizing can't solve, I think. I'll have another go at shaving off a few more cycles, though, which should push that HF noise a bit more towards the inaudible range.

another wonderful engine, thanks and congratulations Utz!
You're pushing more and more the boundaries of this damn beeper!

Thanks utz

Definitely sounds cleaner on fuse and the real hardware recording.

On Spectaculator I think I still prefer the first version of the engine as the parasite tone is lower pitched and doesn't seem to interfere with the tune as much imo

You actually deserve some credit on this, since it was you who brought to my attention that we get a saw wave for free from the frequency calculation Triangle is basically the same thing, just have to negate the channel accu hi-byte if it's >#80.

I have a question about the 1tracker version of this engine. If I understand well, the last column, for drum, has D, prm and Kp. D set the drum type (1=kick, 2=hihat, 3=snare), prm set the parameter for kick (slide speed), Kp more parameter such as starting pitch.

How can we reset this in 1tracker? I wanted to add some effects to the drum, but if I set let's say 002 in the prm and 64 into Kp, I can't go back to "normal" mode, because 0 (empty) is like no new parameter has been set so it continues to has the effect and there is no way to reset the previous ones.

Also it looks like the volume for noise drums such as hithat (2) is working with a value into prm, but not for snare (3)

It's not in the doc but the little d close to T1 and T2 is for detune. That's convenient.

1        drum configuration
        omitted if bit 2 of word 0 is reset
    0..7    drum parameter
        if mode = kick, set the slide speed
        if mode = noise, set the volume
    8..14    if mode = kick, set starting pitch
    14..15    set drum mode:    00 = kick
                10 = noise hi (hihat)
                11 = noise lo (snare)

if I set prm to 256 the value disappear in 1tracker, like for 0. If I set something else (I haven't tried all values though), I get some slides, so after setting it once, I can't cancel it.

oh yes, I've seen this code several time but I didn't come to the conclusion it would have been the default settings, it was obvious anyway.

    drum_type=0;
    drum_slide=20;
    drum_pitch=2;

thank you, it helps!

Great tune Garvalf, particularly like the first half. Love the sound from this engine

Did you use 1-tracker to create it?

Seems to crash at the end though?