new engine: wtbeep

Yes! Great sound.

Added this engine to 1tracker.

Minor issues. It seems that you messed up exx' in the pattern reading a bit, so you can't just have an empty row, or skip first or first and second channels. Edited the code to make it work. Also, there is loud clicks in the third channel after notes, unlike the first two.

No, I wasn't able to figure out clicks. You can hear it just by using the third channel, any notes, it is quite apparent.

Yes, I thought so as well, but wasn't sure 100% either.

I also suspected the exx fix affecting that (like third channel counter value gets lost between rows), but didn't found obvious errors with it.

Thanks Shiru, that's a neat idea for spreading 1-bit sounds outside the 1-bit world.

Meanwhile I know what's up with that carrier hiss. Basically the issue seems to be caused by things leaking into bit 3 of port #fe. Which is by design in this engine, so can't be trivially fixed. Will try to rewrite the engine some day but have no time for it at the moment.

Did a small song using actual wtbeep engine, for CAFe 2019: https://soundcloud.com/shiru1bit/falling-asleep

As I was playing with it in the recent years, I came to conclusion that wtbeep is one of the finest engines available at the moment, at least in regards to the sound diversity combined with the ease of use. The two downsides are is that it is not compatible with +3 (not a big deal), and the carrier hiss that is a bit too audible at times.

So I thinking about possibilities to improve the latter issue. A couple ideas:

- Maybe do 3 sound loops, one is single channel, another is two channel, and the last one is the current three channel one. Tracker can adjust the pitch and set appropriate core per row. This will add a bit clarity, although maybe the hiss will get more noticeable, because it will be turning on and off all the time.

- Maybe make unorthogonal channels. Two with selectable waveforms, and one either a simple square tone (good enough for bass), or variable duty cycle tone. Should probably speed up the sound loop a little bit and make hiss less audible.

Another neat feature to have would be an unequal volume balance, maybe switchable on a per row basis, or two loud channels and one a bit quieter - would be good for echoing stuff. Not too sure if it can be done with the current design, though.

Got some ideas for Phaser continuation, too, although nothing too special. Hooking up the new sampled drums code from the Ear Shaver EX is the obvious one.

Ok, give this version a spin and let me know what you think. Sound loop is 4t longer and outputs are not 8t-aligned, but to my ears it doesn't seem to matter much. Drum timing correction probably needs to be adjusted but I think it wasn't correct to begin with.

Interestingly enough 188t is pretty close to Tritone's 192t, which seems to be kind of a sweet spot, as imo Tritone still wins hands down when it comes to smoothness of sound.

Edit: Got it aligned at 192t. 72t for ch1/2, 48t for ch3 - not the best for unbalanced volumes but perhaps good enough to fake some delay/echo.

I think just adding the aligned/unbalanced version should be enough, unless you think that the unaligned version sounds drastically better (in which case I have a version that brings it down to 182 cycles). Both versions should be +3 compatible.