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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.

Question out to anyone that may be half bored and can easily answer :

I'm trying to get "trantor" music player working on the Microbee. Trantor uses IM2 interrupt mode which the Microbee does not support.
I have spent ages (many afternoons) fiddling trying to remove the IM2 initialisation routine and the interrupt playing snippet of code within, and just essentially turning it into a standard player. I am happy to loudly proclaim that I don't have much knowledge here - and trying to remove IM2 code certainly is not my specialty.

Trantor source here : https://pastebin.com/XSAwL14g

I've also looked at this from the VZ's angle, pretending that this was using VZ interrupt locations and removing required VZ interrupt code - but this is still a no go. (everything so far has just crashed for me)

Anyone interested in having a quick go at it?

Doing the simple changes within the Pytha engine (grabbed from Bintracker) to the Microbee, this happened.
I call it RAGE.

https://www.youtube.com/watch?v=obzLe3lnWLs