C64 routine in assembly to play a tree fall fx

treefall.asm

SID: {
  .label VOICE1_FREQ_1		      = $d400
	.label VOICE1_FREQ_2		      = $d401
	.label VOICE1_CTRL		        = $d404
	.label VOICE1_ATTACK_DECAY	  = $d405
	.label VOICE1_SUSTAIN_RELEASE	= $d406

	.label VOLUME_FILTER_MODES	= $d418
}

TreeFall: {
    lda #%00011011
    sta SID.VOLUME_FILTER_MODES
    lda #%10100000        
    sta SID.VOICE1_FREQ_1
    lda #240
    sta SID.VOICE1_FREQ_2
    lda #%10011010        
    sta SID.VOICE1_ATTACK_DECAY
    lda #%00000111
    sta SID.VOICE1_SUSTAIN_RELEASE
    lda #%00000000        
    sta SID.VOICE1_CTRL
    lda #%10000001
    sta SID.VOICE1_CTRL

    rts
}