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How to make a SPC of sound effect that uses both channels?

Like this submission, how do I make an SPC file of a sound effect that uses both channels?
I'm not sure how they did it but an easy way would be to remake the sound effects as a song to make the SPC.
Originally posted by Kevin
I'm not sure how they did it but an easy way would be to remake the sound effects as a song to make the SPC.

I considered doing that too, I'm just unsure that the music engine will replicate the SFX engine accurately 😅
The easiest way I can come up with is to just play the other sound effect simultaneously by using some asm. You'll have to put one sound effect in 1DF9 and the other in 1DFC, then we add the following code to the sound effect in 1DF9. To make this easier to explain I used the 1C Yoshi Coin and 1F Yoshi sound effects.
Code
#jsr playboth
$DA $06 $03 $54 $B5 $B4 $B5 $B4 $03 $46 $B5 $B4 $03 $38 $B5 $B4 $03 $2A $B5 $B4 $03 $15 $B5 $B4

#asm playboth {
	mov a, #$1F
	mov $03, a
	ret
}

Just replace #$1F with whatever sfx you want to play in 1DFC.