PSST
uint8_t PSST;
SUB_REG(PSST, FXSENDAMOUNT_C, 0xff000000) /* Linear level of channel output sent to FX send bus C */
SUB_REG(PSST, LOOPSTARTADDR, 0x00ffffff) /* Loop start address of the specified channel */
PSST, psst,
CPF, PTRX, CVCF, VTFT, Z1, Z2, PSST, DSL, CCCA, CCR, CLP,
PSST, 0,
PSST, start_addr | (send_amount[2] << 24),
psst = snd_emu10k1_ptr_read(emu, PSST, idx);