Some more cool finds for Phaser4 (currently in development) specifically:
Regular XOR/OR/AND modes in Phaser3 were:
add hl,bc
ld a,h
add ix,sp
xor/and/or ixh
rla
sbc a,a
and 16
out (#fe),a
Now, instead of xor ixh:rla we can do more by changing just two bytes - keeping the ix/iy prefix in place:
cp ixh:nop - the CrossPhase
adc a,ixh:add a,h - fat octaving noisy timbre
xor ixh:sub h - more noise in a similar timbre
xor ixh:sub l - very noisy yet still tonal timbre
xor ixl:sub h - periodic noise of one kind
xor ixl:sub l - periodic noise of another kind
And another cool thing is that Phaser3 unrolls the sound loop 4 times for pseudo volume effects. And we're not obliged to use the same 'algorithm' in each iteration, we can mix in any 4, getting even more weird timbres.