ESS_MREG_SAMPLE_RATE
ess_write_mix_reg(sc, ESS_MREG_SAMPLE_RATE, ess_srtotc(rate));
reg1 = ess_read_mix_reg(sc, ESS_MREG_SAMPLE_RATE);
ess_write_mix_reg(sc, ESS_MREG_SAMPLE_RATE, reg2);
if (ess_read_mix_reg(sc, ESS_MREG_SAMPLE_RATE) != reg2) {