The only two AY calls:
------------------------------------------------
012e 06f4 ld b,0f4h
0130 ed79 out (c),a
0132 06f6 ld b,0f6h
0134 3e80 ld a,80h
0136 ed79 out (c),a
0138 af xor a
0139 ed79 out (c),a
013b c9 ret
------------------------------------------------
013c 06f6 ld b,0f6h
013e 3ec0 ld a,0c0h
0140 ed79 out (c),a
0142 06f4 ld b,0f4h
0144 ed59 out (c),e
0146 06f6 ld b,0f6h
0148 af xor a
0149 ed79 out (c),a
014b c9 ret
------------------------------------------------
And this is one of the routines which call them:
01e3 322001 ld (0120h),a
01e6 221e01 ld (011eh),hl
01e9 1e01 ld e,01h
01eb cd3c01 call 013ch
01ee af xor a
01ef cd2e01 call 012eh
01f2 1e00 ld e,00h
01f4 cd3c01 call 013ch
01f7 af xor a
01f8 cd2e01 call 012eh
01fb 1e07 ld e,07h
01fd cd3c01 call 013ch
0200 3e3e ld a,3eh
0202 cd2e01 call 012eh
0205 3a2d01 ld a,(012dh)
0208 5f ld e,a
0209 cd3c01 call 013ch
020c 3a2001 ld a,(0120h)
020f 57 ld d,a
0210 2a1e01 ld hl,(011eh)
0213 1e3f ld e,3fh
0215 7e ld a,(hl)
0216 e60f and 0fh
0218 cd2e01 call 012eh
021b 3a1c01 ld a,(011ch)
021e 47 ld b,a
021f 10fe djnz 021fh
0221 7e ld a,(hl)
0222 cb2f sra a
0224 cb2f sra a
0226 cb2f sra a
0228 cb2f sra a
022a e60f and 0fh
022c cd2e01 call 012eh
022f 3a1c01 ld a,(011ch)
0232 47 ld b,a
0233 10fe djnz 0233h
0235 00 nop
0236 00 nop
0237 00 nop
0238 23 inc hl
0239 1d dec e
023a c21502 jp nz,0215h
023d 15 dec d
023e c21002 jp nz,0210h
0241 c9 ret
I suposse that is the only part of the code that we must modify to port the app to the Enterprise.
Sorry I can't go further as I don't know a word of sound chips....