Hi there,
 
hope, s.o. can provide a clue on why I have no sound on my iMac, which with 
OS-X has no issues with sound at all. Full dmesg at the end.

sndio is running:
$ top | grep sndio
31429 _sndio     2  -20  480K  984K idle      poll      0:01  0.00% sndiod

I have /etc/mixerctl.conf with just three lines:
outputs.master=255,255
outputs.spkr_mute=off
outputs.spkr2_mute=off

Output is not muted by audioctl as this shows:
$ audioctl -f /dev/audio
name=HD-Audio
version=1.0
config=azalia0
encodings=slinear_le:16:2:1,slinear_le:20:4:1,slinear_le:24:4:1
properties=full_duplex,independent
full_duplex=0
fullduplex=0
blocksize=9600
hiwat=6
lowat=4
output_muted=0
monitor_gain=0
mode=play
play.rate=48000
play.channels=2
play.precision=16
play.bps=2
play.msb=1
play.encoding=slinear_le
play.gain=255
play.balance=32
play.port=0x0
play.avail_ports=0x0
play.seek=0
play.samples=0
play.eof=0
play.pause=0
play.error=0
play.waiting=0
play.open=1
play.active=0
play.buffer_size=65536
play.block_size=9600
play.errors=0
record.rate=48000
record.channels=2
record.precision=16
record.bps=2
record.msb=1
record.encoding=slinear_le
record.gain=125
record.balance=32
record.port=0x0
record.avail_ports=0x0
record.seek=0
record.samples=0
record.eof=0
record.pause=0
record.error=0
record.waiting=0
record.open=1
record.active=0
record.buffer_size=65536
record.block_size=9600
record.errors=0

Same with 'mixerctl -v' (as expected with given mixerctl.conf, see above):
$ mixerctl -v
record.adc-0:1_mute=off  [ off on ]
record.adc-0:1=125,125
record.adc-2:3_mute=off  [ off on ]
record.adc-2:3=125,125
record.adc-4:5_mute=off  [ off on ]
record.adc-4:5=125,125
record.dig-adc-0:1_sou=SPDIF-in  [ SPDIF-in ]
inputs.mix_source=beep,hp,line-in  { mic beep hp line-in }
inputs.mix_mic=120,120
inputs.mix_beep=120,120
inputs.mix_hp=120,120
inputs.mix_line-in=120,120
outputs.mix2=192,192
inputs.mix2_source=dac-0:1,mix  { dac-0:1 mix }
outputs.mix3=126,126
inputs.mix3_source=dac-2:3,mix  { dac-2:3 mix }
outputs.mix4=192,192
inputs.mix4_source=dac-4:5,mix  { dac-4:5 mix }
outputs.mix5=126,126
inputs.mix5_source=dac-6:7,mix  { dac-6:7 mix }
outputs.hp_source=mix2  [ mix2 mix3 mix4 mix5 mix9 ]
outputs.hp_mute=off  [ off on ]
inputs.hp=85,85
outputs.hp_dir=output  [ none output input input-vr0 input-vr50 input-vr80 
input-vr100 ]
outputs.hp_boost=off  [ off on ]
outputs.line-in_source=mix3  [ mix2 mix3 mix4 mix5 mix9 ]
outputs.line-in_mute=off  [ off on ]
inputs.line-in=85,85
outputs.line-in_dir=input  [ none output input input-vr0 input-vr50 input-vr80 
input-vr100 ]
outputs.line-in_boost=off  [ off on ]
outputs.spkr_source=mix4  [ mix2 mix3 mix4 mix5 mix9 ]
outputs.spkr_mute=off  [ off on ]
outputs.spkr_dir=output  [ none output input input-vr0 input-vr50 input-vr80 
input-vr100 ]
outputs.spkr_boost=off  [ off on ]
inputs.mic=85,85
outputs.mic_dir=input-vr80  [ none output input input-vr0 input-vr50 input-vr80 
input-vr100 ]
outputs.spkr2_source=mix4  [ mix2 mix3 mix4 mix5 mix9 ]
outputs.spkr2_mute=off  [ off on ]
outputs.spkr2_dir=output  [ none output input input-vr0 input-vr50 input-vr80 
input-vr100 ]
outputs.spkr2_boost=off  [ off on ]
outputs.SPDIF_source=dig-dac-0:1  [ dig-dac-0:1 ]
record.adc-4:5_source=mic,beep,hp,line-in,mix  { mic beep hp line-in mix }
record.adc-2:3_source=mic,beep,hp,line-in,mix  { mic beep hp line-in mix }
record.adc-0:1_source=mic,beep,hp,line-in,mix  { mic beep hp line-in mix }
outputs.mix9=126,126
inputs.mix9_source=dac-8:9,mix  { dac-8:9 mix }
outputs.hp_sense=plugged  [ unplugged plugged ]
outputs.line-in_sense=plugged  [ unplugged plugged ]
outputs.spkr2_muters=hp,line-in  { hp line-in }
outputs.master=255,255
outputs.master.mute=off  [ off on ]
outputs.master.slaves=mix2,mix4,hp,spkr,spkr2  { mix2 mix3 mix4 mix5 hp line-in 
spkr mic spkr2 mix9 }
record.volume=125,125
record.volume.mute=off  [ off on ]
record.volume.slaves=adc-0:1,adc-2:3,adc-4:5  { adc-0:1 adc-2:3 adc-4:5 hp 
line-in spkr mic spkr2 }
outputs.mode=analog  [ analog digital ]
record.mode=analog  [ analog digital ]

While 'man azalia' tells me that NVIDIA MCP79 is supported dmesg tells me that 
"NVIDIA MCP79 Memory" is 'not configured' - is this relevant here?
$ dmesg | grep MCP79
pchb0 at pci0 dev 0 function 0 "NVIDIA MCP79 Host" rev 0xb1
"NVIDIA MCP79 Memory" rev 0xb1 at pci0 dev 0 function 1 not configured
pcib0 at pci0 dev 3 function 0 "NVIDIA MCP79 ISA" rev 0xb2
"NVIDIA MCP79 Memory" rev 0xb1 at pci0 dev 3 function 1 not configured
nviic0 at pci0 dev 3 function 2 "NVIDIA MCP79 SMBus" rev 0xb1
"NVIDIA MCP79 Memory" rev 0xb1 at pci0 dev 3 function 3 not configured
"NVIDIA MCP79 Co-processor" rev 0xb1 at pci0 dev 3 function 5 not configured
ohci0 at pci0 dev 4 function 0 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 11, 
version 1.0, legacy support
ehci0 at pci0 dev 4 function 1 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 10
ohci1 at pci0 dev 6 function 0 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 7, 
version 1.0, legacy support
ehci1 at pci0 dev 6 function 1 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 5
azalia0 at pci0 dev 8 function 0 "NVIDIA MCP79 HD Audio" rev 0xb1: apic 1 int 15
ppb0 at pci0 dev 9 function 0 "NVIDIA MCP79 PCIE" rev 0xb1
nfe0 at pci0 dev 10 function 0 "NVIDIA MCP79 LAN" rev 0xb1: apic 1 int 14, 
address 00:26:b0:d9:00:c6
pciide0 at pci0 dev 11 function 0 "NVIDIA MCP79 SATA" rev 0xb1: DMA
ppb1 at pci0 dev 12 function 0 "NVIDIA MCP79 PCIE" rev 0xb1: msi
ppb2 at pci0 dev 16 function 0 "NVIDIA MCP79 PCIE" rev 0xb1
ppb3 at pci0 dev 21 function 0 "NVIDIA MCP79 PCIE" rev 0xb1: msi
ppb4 at pci0 dev 22 function 0 "NVIDIA MCP79 PCIE" rev 0xb1: msi

At this point I am lost - I have no clue where to investigate from here on.
Any help is appreciated!
 
I shall not finish without a big THANK YOU to the devs for this fine OS they 
share with the 'rest of the world'!
 
All the best,
STEFAN



OpenBSD 5.4-current (GENERIC.MP) #53: Sun Sep  8 15:28:55 MDT 2013
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
RTC BIOS diagnostic error 
f7<clock_battery,ROM_cksum,config_unit,memory_size,invalid_time>
real mem = 8279707648 (7896MB)
avail mem = 8051195904 (7678MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xe0000 (43 entries)
bios0: vendor Apple Inc. version "IM91.88Z.008D.B08.0904271717" date 04/27/09
bios0: Apple Inc. iMac9,1
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP HPET APIC MCFG ASF! SBST ECDT SSDT SSDT SSDT
acpi0: wakeup devices EC__(S3) OHC1(S3) EHC1(S3) OHC2(S3) EHC2(S3) GIGE(S5)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 25000000 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM)2 Duo CPU E8135 @ 2.66GHz, 1592.22 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF
cpu0: 6MB 64b/line 16-way L2 cache
cpu0: smt 0, core 0, package 0
cpu0: apic clock running at 265MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM)2 Duo CPU E8135 @ 2.66GHz, 1592.01 MHz
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF
cpu1: 6MB 64b/line 16-way L2 cache
cpu1: smt 0, core 1, package 0
ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 11, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 1
acpimcfg0 at acpi0 addr 0xf0000000, bus 0-255
acpiec0 at acpi0
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 3 (IXVE)
acpicpu0 at acpi0: C3, C2, C1, PSS
acpicpu1 at acpi0: C3, C2, C1, PSS
acpibtn0 at acpi0: PWRB
acpibtn1 at acpi0: SLPB
cpu0: Enhanced SpeedStep 1592 MHz: speeds: 2660, 2394, 2128, 1862, 1596 MHz
memory map conflict 0xffc00000/0x400000
pci0 at mainbus0 bus 0
0:3:5: mem address conflict 0xd3500000/0x80000
pchb0 at pci0 dev 0 function 0 "NVIDIA MCP79 Host" rev 0xb1
"NVIDIA MCP79 Memory" rev 0xb1 at pci0 dev 0 function 1 not configured
pcib0 at pci0 dev 3 function 0 "NVIDIA MCP79 ISA" rev 0xb2
"NVIDIA MCP79 Memory" rev 0xb1 at pci0 dev 3 function 1 not configured
nviic0 at pci0 dev 3 function 2 "NVIDIA MCP79 SMBus" rev 0xb1
iic0 at nviic0
spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-8500 SO-DIMM
spdmem1 at iic0 addr 0x51: 4GB DDR3 SDRAM PC3-8500 SO-DIMM
iic1 at nviic0
"NVIDIA MCP79 Memory" rev 0xb1 at pci0 dev 3 function 3 not configured
vendor "NVIDIA", unknown product 0x0a98 (class memory subclass RAM, rev 0xb1) 
at pci0 dev 3 function 4 not configured
"NVIDIA MCP79 Co-processor" rev 0xb1 at pci0 dev 3 function 5 not configured
ohci0 at pci0 dev 4 function 0 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 11, 
version 1.0, legacy support
ehci0 at pci0 dev 4 function 1 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 10
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "NVIDIA EHCI root hub" rev 2.00/1.00 addr 1
ohci1 at pci0 dev 6 function 0 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 7, 
version 1.0, legacy support
ehci1 at pci0 dev 6 function 1 "NVIDIA MCP79 USB" rev 0xb1: apic 1 int 5
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 "NVIDIA EHCI root hub" rev 2.00/1.00 addr 1
azalia0 at pci0 dev 8 function 0 "NVIDIA MCP79 HD Audio" rev 0xb1: apic 1 int 15
azalia0: codecs: Realtek ALC885
audio0 at azalia0
ppb0 at pci0 dev 9 function 0 "NVIDIA MCP79 PCIE" rev 0xb1
pci1 at ppb0 bus 1
nfe0 at pci0 dev 10 function 0 "NVIDIA MCP79 LAN" rev 0xb1: apic 1 int 14, 
address 00:26:b0:d9:00:c6
rgephy0 at nfe0 phy 1: RTL8169S/8110S PHY, rev. 2
pciide0 at pci0 dev 11 function 0 "NVIDIA MCP79 SATA" rev 0xb1: DMA
pciide0: using apic 1 int 11 for native-PCI interrupt
wd0 at pciide0 channel 0 drive 0: <Hitachi HDT721064SLA360>
wd0: 16-sector PIO, LBA48, 610480MB, 1250263728 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6
atapiscsi0 at pciide0 channel 1 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <OPTIARC, DVD RW AD-5670S, 2AHH> ATAPI 5/cdrom 
removable
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 5
ppb1 at pci0 dev 12 function 0 "NVIDIA MCP79 PCIE" rev 0xb1: msi
pci2 at ppb1 bus 2
ppb2 at pci0 dev 16 function 0 "NVIDIA MCP79 PCIE" rev 0xb1
pci3 at ppb2 bus 3
vga1 at pci3 dev 0 function 0 vendor "NVIDIA", unknown product 0x0867 rev 0xb1
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
ppb3 at pci0 dev 21 function 0 "NVIDIA MCP79 PCIE" rev 0xb1: msi
pci4 at ppb3 bus 4
"Broadcom BCM4322" rev 0x01 at pci4 dev 0 function 0 not configured
ppb4 at pci0 dev 22 function 0 "NVIDIA MCP79 PCIE" rev 0xb1: msi
pci5 at ppb4 bus 5
"AT&T/Lucent FW643 1394" rev 0x07 at pci5 dev 0 function 0 not configured
isa0 at pcib0
isadma0 at isa0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
usb2 at ohci0: USB revision 1.0
uhub2 at usb2 "NVIDIA OHCI root hub" rev 1.00/1.00 addr 1
usb3 at ohci1: USB revision 1.0
uhub3 at usb3 "NVIDIA OHCI root hub" rev 1.00/1.00 addr 1
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
umass0 at uhub0 port 1 configuration 1 interface 0 "Intenso External USB 3.0" 
rev 2.10/2.05 addr 2
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets, initiator 0
sd0 at scsibus1 targ 1 lun 0: <Intenso, External USB 3.0, 0205> SCSI4 0/direct 
fixed serial.152d0539201204262146
sd0: 1907729MB, 512 bytes/sector, 3907028992 sectors
umass1 at uhub0 port 3 configuration 1 interface 0 "TOSHIBA STOR.E PARTNER" rev 
2.10/1.00 addr 3
umass1: using SCSI over Bulk-Only
scsibus2 at umass1: 2 targets, initiator 0
sd1 at scsibus2 targ 1 lun 0: <TOSHIBA, STOR.E PARTNER, GU00> SCSI3 0/direct 
fixed serial.0480b0012011121901AB
sd1: 953869MB, 512 bytes/sector, 1953525168 sectors
uvideo0 at uhub0 port 4 configuration 1 interface 0 "Apple Inc. Built-in 
iSight" rev 2.00/2.19 addr 4
video0 at uvideo0
ugen0 at uhub0 port 4 configuration 1 "Apple Inc. Built-in iSight" rev 
2.00/2.19 addr 4
uhub4 at uhub1 port 4 "Genesys Logic USB2.0 Hub" rev 2.00/9.01 addr 2
umass2 at uhub4 port 1 configuration 1 interface 0 "Toshiba External USB 3.0" 
rev 2.10/0.01 addr 3
umass2: using SCSI over Bulk-Only
scsibus3 at umass2: 2 targets, initiator 0
sd2 at scsibus3 targ 1 lun 0: <TOSHIBA, External USB 3.0, 0001> SCSI4 0/direct 
fixed serial.0480a006011110451990
sd2: 953869MB, 512 bytes/sector, 1953525168 sectors
uhub5 at uhub4 port 4 "Genesys Logic USB2.0 Hub" rev 2.00/9.01 addr 4
umass3 at uhub5 port 2 configuration 1 interface 0 "TOSHIBA STOR.E ALU 2S" rev 
2.10/0.01 addr 5
umass3: using SCSI over Bulk-Only
scsibus4 at umass3: 2 targets, initiator 0
sd3 at scsibus4 targ 1 lun 0: <TOSHIBA, STOR.E ALU 2S, 0001> SCSI4 0/direct 
fixed serial.09300b1a120705130071
sd3: 953869MB, 512 bytes/sector, 1953525168 sectors
uhidev0 at uhub2 port 5 configuration 1 interface 0 "Apple Computer, Inc. IR 
Receiver" rev 2.00/0.16 addr 2
uhidev0: iclass 3/0, 38 report ids
uhid0 at uhidev0 reportid 36: input=4, output=0, feature=0
uhid1 at uhidev0 reportid 37: input=4, output=0, feature=0
uhid2 at uhidev0 reportid 38: input=4, output=0, feature=0
uhub6 at uhub3 port 1 "Apple Inc. BRCM2046 Hub" rev 2.00/1.00 addr 2
ugen1 at uhub6 port 1 "Apple Inc. Bluetooth USB Host Controller" rev 2.00/1.80 
addr 3
uhidev1 at uhub6 port 2 configuration 1 interface 0 "Apple Computer product 
0x820a" rev 2.00/1.00 addr 4
uhidev1: iclass 3/1, 1 report id
ukbd0 at uhidev1 reportid 1: 8 variable keys, 6 key codes
wskbd0 at ukbd0: console keyboard, using wsdisplay0
uhidev2 at uhub6 port 3 configuration 1 interface 0 "Apple Computer product 
0x820b" rev 2.00/1.00 addr 5
uhidev2: iclass 3/1, 2 report ids
ums0 at uhidev2 reportid 2: 3 buttons
wsmouse0 at ums0 mux 0
vscsi0 at root
scsibus5 at vscsi0: 256 targets
softraid0 at root
scsibus6 at softraid0: 256 targets
root on wd0a (8ee3d2e3a2b38ea9.a) swap on wd0b dump on wd0b
uhidev_intr: bad repid 19
uhidev_intr: bad repid 19
uhidev_intr: bad repid 19
uhidev_intr: bad repid 19

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