A new day, a new ZX Spectrum 1-bit routine. This one features 4 square wave channels with variable duty cycle. One of the channels can also play noise instead of tone.

Download (includes XM converter): https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/blob/master/quattropic.zip?raw=true
Source: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/tree/master/quattropic
7days7engines release thread: http://randomflux.info/1bit/viewtopic.php?id=39

7days7engines Day 2: quattropic - test1

For day 3 of my little coding spree, I've got an engine with 2x3=6 square wave channels for you. Sound is a little more rough than in engines of the same type with less channels, but well, that's what happens if you push things. This engine also has variable pulse widths, although less fine-grained than normally.

download (includes XM converter as usual): https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/blob/master/xtone.zip?raw=true
source: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/tree/master/xtone
release thread: http://randomflux.info/1bit/viewtopic.php?id=39

7days7engines Day 3: xtone test1

Hadn't written a pin pulse engine in ages, so it was time to change that :) Octode 2k15 is a rewrite of Shiru's 8-channel Octode engine, which fixes the detune issues of the latter by using 16-bit frequency counting. The sound is somewhere half-way between the original Octode and introspec's "XL" mod.

download: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/blob/master/quattropic.zip?raw=true (includes XM converter)
source: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/tree/master/octode2k15
7d7e release thread: http://randomflux.info/1bit/viewtopic.php?id=39

7days7engines Day 4: Octode 2k15 test1

Another version of the Octode routine, this time with pulse-interleaving synthesis instead of pulse frequency modulation. It's quite noisy, perhaps 8 channels of square wave sound is a bit too much for the Speccy beeper...

download: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/blob/master/octodepwm.zip?raw=true (includes XM converter)
source: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/tree/master/octodepwm
7d7e release thread: http://randomflux.info/1bit/viewtopic.php?id=39

7days7engines Day 5: Octode PWM test1

Why settle for 2 channels of sample playback if you can have 3? Here's yawp, aka Yet Another Wave Player. Somewhat more rough sound quality than qaop, but hey, still better than SampleTracker :D

download: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/blob/master/yawp.zip?raw=true(includes XM converter)
source: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/tree/master/yawp
7d7e release thread: http://randomflux.info/1bit/viewtopic.php?id=39

7days7engines Day 6: yawp test1

A beeper engine in 86 bytes :o This is the last installment in the 7days7engines project. Not a really serious one, but I had to fill the week somehow ;)

download: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/blob/master/nanobeep.zip?raw=true (includes XM convert)
source: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/tree/master/nanobeep
7d7e release thread: http://randomflux.info/1bit/viewtopic.php?id=39

7days7engines Day 7: nanobeep test1

1-bit fanatic, sound driver coder, calculator abuser, binary modulation researcher

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