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Aha, Thanks heaps Utz.
Heh! I just couldnt quite get the right URL structure. Will grab and upload.

>  I've built a number of converters from various PSG chips that I can then transform to the .1tm format.
Thats pretty darn cool !
Will the converter be released?  Would love to hear how "A Mind Is Born" comes out. I love that!

6502 : Look at the Peskysound engine within 1Tracker. For the PET which also runs the 6502.
http://shiru.untergrund.net/software.shtml
I'll shutup now and leave it for Shiru to answer properly.

I don't physically have one of these - I was just really intrigued to see if 1bit audio was even possible. Answer is a definite yes.
These computers do have an AY audio chip, and a pysical internal speaker.

I have since experimented with 1k2b but unfortunately didn't get very far.
Granted I really don't know what I'm doing here, but Chronos & Startip2 sort of looked straight forward of changing their looped out/out channels to in/out, and, did manage to get audio from both, (with a lot of noise of course).
First few seconds of Chronos even starts off sounding like Chronos.  Am using the emulator 'EightyOne' which supports the 16k Jupiter Ace. Free memory is from $4000 onwards; I assume that this emulator does support the entire 49k that is possible with these things. Assemble straight to a flat '.BIN' object file, and the emulator has a bin load into whatever memory location. Jupiter Ace runs Forth rather than BASIC, so then you just call it via the forth command :    16384 CALL

Shiru's Earshaver 11-track album now runs on the Microbee.  I'm hoping that I've done the original music some justice.

A bit of noise still there during transitions - perhaps something else specific to the bus in the Microbee(?). Timing seems to be spot on since there isn't any changes required other than the Microbee only needing $16 & $18 within the source to be changed to $40 to drive the speaker that sits on bit 6 on port $02.

All tracks assembled to $100 (standard CP/M .COM file), which, will autostart/autoplay. As mentioned above in a previous post. Out of about six emulators, I have found that MESS with the Microbee ROM selected to be the nicest & accurate Microbee emulator so far.

All credits to Shiru. Album for Microbee is here : https://github.com/bushy555/microbee_1-bit_music

Coincidentally updated on 2/Oct as well.

Download : https://github.com/tildearrow/furnace/releases/tag/v0.6

Even works on XP! Some 240 included music demos for differing platforms.
Can change to lots of different chipsets. Speccy included.  Doom level 1 (c64) demo still sounds half ok in ZX quadtone engine.
Appears to only export to WAV and pattern text output at this stage; unless I am missing something.
Haven't yet read the huge manual yet.

Many thanks Shiru.

Somewhat useless update - no videos or recordings yet.
Have started integrating playing through internal peizo speaker as well as cassette port on a few of the engines now.

Also have been dabbling in playing the music through the VZ/Laser printer interface port connected directly to some amplified speakers. It is as dead-set so simple as changing the ZX's OUT($FE), A to the VZ's OUT($E), A which is in the range of the printer port being from 0 to $F. No idea why I actually chose $E though. It works.  Connect Centronics pin 6 (D4) to amplified speakers and away we go. 
Still fiddling with it; some of the engines that can output the full 256 bits to the port will make use of a 8-bit R2R resistor DAC, or down the track the use of a dedicated 8-bit DAC chip. (....but this is going 7 bits off-topic.)

Anyway, so far the printer port sounds pretty nifty on TRITONE, Phaser1, 2, and 3, PhaserX, SQUAT and SQUATM; a far nicer fuller sound than the very "tinny" sound of the internal speaker.
Have implemented an output device menu selection for a few of the engines/songs being : Speaker / Cassette Port / Printer Port.

I really wish that this existed back in the 1983 era!

Unsure how and no idea. The few times I managed to get it running last week, it was actually sounding way too slow.
And this is after I removed the few opcodes of the ZX keyboard read routine. It was still sounding slow so I removed the two spare timing NOP's within just to see how much affect that it would have; and it did near to nothing.

But then as I ran it again last night in the same emulator (no changes to the emu), I was incredibly surprised to hear it running at the speed that it is.  And this was without the keyboard, but with the two NOPs in the inner loop.

(For those playing along at home, it's the SquatM engine.)

Identical as far as I'm aware - Both are at 3.5 mhz

Will keep fiddling with the sprinkling of NOPs to get it sounding nicer.
However I am now wondering if it is the emulator that is a bit dicey, and isn't playing nicely.
Unfortunately I don't have an Aquarius computer to try it on.

Managed to get a very rough recording.
This version runs way way too quick, so much that the samples are being skipped.
Needs further work.

https://youtu.be/y0M9qiRdWEk

...months later:

I've managed to do about 15 tunes from about 11 or 12 engines.
https://github.com/bushy555/Aquarius_1-bit_music

Two locations for the Aquarius rom cartridge : $e000 for 8k roms and $C000 for 16k.
I can only get the combined engine + music that is in total 8k to execute in any emulator.
Up to 16l assemble fine of course to $c000, but just wont run.
Typical normal binaries assemble to $4000 - and I can't get these working either.
I want to say that, initially, the Aquarius seems very "finicky" and very particular on its needs. But it will just come down to my lack of knowledge and understanding of this computers setup.

Ive been using an old emulator 'VirtualAquarius' : http://www.oocities.org/emucompboy/
Or, roms for mess/mame can be grabbed here : https://github.com/bushy555/MESS_MAME_ROMS

I'd youtube a few tunes, but, I don't think that its really worth the effort.

'Moggy' seems to not approve.