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ant1: haha

I like the tech behind the picture.

Was intrigued to find out how this is done so here's a little bit of code.  I'm not sure you'll get perfect playback (due to the slight adsr changes when setting registers in a different order) but it at least gives you the data for single vblank songs.

sei
; init your song driver wherever it is, usually $1000
jsr $1000 

loop

; wait for raster
raster
lda $d012
cmp #$fe
bne raster

; set $d000 area to ram so sid data can be read

lda #$34
sta $01

; call a vblank of your song. (usually $1003)

jsr $1003

; grab the registers and store them somewhere, in this case $9000
; and bung them on screen so we can see the raw data.

ldy #$00
registers
lda $d400,y
sta $9000,y
sta $0400,y
iny
cpy #$20
bne registers

; set sid back to usual so we can write to it.

lda #$35
sta $01

; write registers back to the sid chip, doing that backwards seems to give more accurate playback.

ldy #$1f
registers2
lda $9000,y
sta $d400,y
dey
bpl registers2

jmp loop

I suppose Wallflower and Glitchshifter and generative.  Both use timers with math functions to create the music, Glitchshifter uses it to generate the waveforms too.

actually if you want pure (not sequenced) liveplay then retroskoi is worth a look.  I might as well post this here as it's not that well known.

You can update the pattern list in realtime in a few of the existing ones, if that's what you mean. (johnplayer and SDI for example, Goattracker can do that too)