I am able to make a simple up-scaled sound effect in ca65 but if I want to add another sound, it won't let me?

; Do a up-scaled sweep sound

lda #1

sta $4015 ; Turn on the sound output

lda #$FF

sta $4000 ; pAPU Sound Register 1 (sq)

lda #%11011011

sta $4001

lda #$A5

sta $4002

lda #$AB

sta $4003

; Do a second up-scaled sweep sound

lda #1

sta $4015

lda #$FF

sta $4000 ; pAPU Sound Register 1 (sq)

lda #%11011011

sta $4001

lda #$A5

sta $4002

lda #$AB

sta $4003

; Do a up-scaled sweep sound

lda #1

sta $4015 ; Turn on the sound output

lda #$FF

sta $4000 ; pAPU Sound Register 1 (sq)

lda #%11011011

sta $4001

lda #$A5

sta $4002

lda #$AB

sta $4003

; Do a second up-scaled sweep sound

lda #1

sta $4015

lda #$FF

sta $4000 ; pAPU Sound Register 1 (sq)

lda #%11011011

sta $4001

lda #$A5

sta $4002

lda #$AB

sta $4003