> > I have a revision 1 chip.
> 
> Interesting.  That's an OPL3-SA2 (YMF711) chip.
> SA2 and SA3 are not so much different and I think the driver works on SA2
> except for some functions are missing (SA2 doesn't have equalizer, etc.).

You are right, this is an SA2 chip.  And I am trying to use the SA3 driver.
Funky that it works at all, hehe.

from my dmesg:

ym0: OPL3-SA2 Sound Board : OPL3-SA3
midi0 at opl0: OPL3-SA3 Yamaha OPL3
midi1 at mpu0: OPL3-SA3 MPU-401 MIDI UART
joy0: OPL3-SA2 Sound Board 
isapnp0: <OPL3-SA2 Sound Board, YMH002F, , > port 0x100/8 not configured
wdc2: OPL3-SA2 Sound Board 

My card does have an equalizer, from mixerctl -a:
inputs.dac=179,179
inputs.dac.mute=off
inputs.midi=184,184
inputs.midi.mute=off
inputs.cd=220,220
inputs.cd.mute=off
inputs.line=220,220
inputs.line.mute=on
inputs.speaker=0
inputs.speaker.mute=on
inputs.mic=0
inputs.mic.mute=on
monitor.monitor=0
monitor.monitor.mute=on
record.record=220,220
record.record.source=mic
outputs.master=220,220
outputs.master.mute=off
equalization.mode=desktop
equalization.treble=0,0
equalization.bass=0,0
equalization.surround=0,0
power.save=powersave
power.save.timeout=5

Ben