-extern u16 AudioInBuffer, AudioOutBuffer, AudioCount;
-extern u16 AudioAuxA, AudioAuxC, AudioAuxE;
-extern u32 loopval; // Value set by A_SETLOOP : Possible conflict with SETVOLUME???
+/* FIXME: this decomposition into 3 ABI is not accurate,
+ * there are a least 9 or 10 different ABI, each with one or a few revisions
+ * for a total of almost 16 differents audio ucode.
+ *
+ * ABI2 in fact is a mix of at least 7 differents ABI which are mostly compatible
+ * but not totally, that's why there is a isZeldaABI/isMKABI workaround.
+ */
+extern const acmd_callback_t ABI1[0x10];
+extern const acmd_callback_t ABI2[0x20];
+extern const acmd_callback_t ABI3[0x10];