My ymf724f does not have spdif, only with ac97 stac9704

Is it feasible to remove playback device 2 (rear) and control (e.g. 4 ch Duplication) by checking sdac bit of ac97 registers to know that it does not support 4 channels ?

How about device 1 spdif since this card does not have spdif connector ?

what is the difference of capture device 0 and device 3 ?

!!PCI Soundcards installed in the system !!--------------------------------------

04:02.0 Multimedia audio controller: Yamaha Corporation YMF-724F [DS-1 Audio Controller] (rev 03)

!!Advanced information - PCI Vendor/Device/Susbsystem ID's !!--------------------------------------------------------

04:02.0 0401: 1073:000d (rev 03) Subsystem: 1073:000d

Simple mixer control 'IEC958',0 Capabilities: cvolume pswitch pswitch-joined cswitch cswitch-joined penum Playback channels: Mono Capture channels: Front Left - Front Right Limits: Capture 0 - 16383 Mono: Playback [off] Front Left: Capture 0 [0%] [-99999.99dB] [off] Front Right: Capture 0 [0%] [-99999.99dB] [off] Simple mixer control 'IEC958 AC97',0 Capabilities: pvolume penum Playback channels: Front Left - Front Right Limits: Playback 0 - 16383 Mono: Front Left: Playback 16383 [100%] [0.00dB] Front Right: Playback 16383 [100%] [0.00dB] Simple mixer control 'IEC958 AC97',1 Capabilities: pvolume penum Playback channels: Front Left - Front Right Limits: Playback 0 - 16383 Mono: Front Left: Playback 0 [0%] [-99999.99dB] Front Right: Playback 0 [0%] [-99999.99dB] Simple mixer control 'IEC958 Loop',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'IEC958',1 Capabilities: cvolume penum Capture channels: Front Left - Front Right Limits: Capture 0 - 16383 Front Left: Capture 0 [0%] [-99999.99dB] Front Right: Capture 0 [0%] [-99999.99dB]

Simple mixer control '4ch Duplication',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'ADC',0 Capabilities: pvolume cvolume penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 16383 Capture 0 - 16383 Front Left: Playback 0 [0%] [-99999.99dB] Capture 16383 [100%] [0.00dB] Front Right: Playback 0 [0%] [-99999.99dB] Capture 16383 [100%] [0.00dB] Simple mixer control 'ADC',1 Capabilities: pvolume cvolume penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 16383 Capture 0 - 16383 Front Left: Playback 0 [0%] [-99999.99dB] Capture 0 [0%] [-99999.99dB] Front Right: Playback 0 [0%] [-99999.99dB] Capture 0 [0%] [-99999.99dB] Simple mixer control 'Digital',0 Capabilities: cvolume penum Capture channels: Front Left - Front Right Limits: Capture 0 - 16383 Front Left: Capture 16383 [100%] [0.00dB] Front Right: Capture 16383 [100%] [0.00dB] Simple mixer control 'Digital',1 Capabilities: cvolume penum Capture channels: Front Left - Front Right Limits: Capture 0 - 16383 Front Left: Capture 16383 [100%] [0.00dB] Front Right: Capture 16383 [100%] [0.00dB]

**** List of PLAYBACK Hardware Devices **** card 0: YMF724F [Yamaha DS-1 (YMF724F)], device 0: YMFPCI [YMFPCI] Subdevices: 32/32 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 Subdevice #8: subdevice #8 Subdevice #9: subdevice #9 Subdevice #10: subdevice #10 Subdevice #11: subdevice #11 Subdevice #12: subdevice #12 Subdevice #13: subdevice #13 Subdevice #14: subdevice #14 Subdevice #15: subdevice #15 Subdevice #16: subdevice #16 Subdevice #17: subdevice #17 Subdevice #18: subdevice #18 Subdevice #19: subdevice #19 Subdevice #20: subdevice #20 Subdevice #21: subdevice #21 Subdevice #22: subdevice #22 Subdevice #23: subdevice #23 Subdevice #24: subdevice #24 Subdevice #25: subdevice #25 Subdevice #26: subdevice #26 Subdevice #27: subdevice #27 Subdevice #28: subdevice #28 Subdevice #29: subdevice #29 Subdevice #30: subdevice #30 Subdevice #31: subdevice #31 card 0: YMF724F [Yamaha DS-1 (YMF724F)], device 1: YMFPCI - IEC958 [YMFPCI - IEC958] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: YMF724F [Yamaha DS-1 (YMF724F)], device 2: YMFPCI - Rear [YMFPCI - Rear PCM] Subdevices: 1/1 Subdevice #0: subdevice #0

ARECORD

**** List of CAPTURE Hardware Devices **** card 0: YMF724F [Yamaha DS-1 (YMF724F)], device 0: YMFPCI [YMFPCI] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: YMF724F [Yamaha DS-1 (YMF724F)], device 3: YMFPCI - PCM2 [YMFPCI - AC'97] Subdevices: 1/1 Subdevice #0: subdevice #0

!!AC97 Codec information !!---------------------------

0-0/0: SigmaTel STAC9704

PCI Subsys Vendor: 0x0000 PCI Subsys Device: 0x0000

Flags: 0 Capabilities : DAC resolution : 18-bit ADC resolution : 18-bit 3D enhancement : SigmaTel 3D Enhancement

Current setup Mic gain : +0dB [+0dB] POP path : pre 3D Sim. stereo : off 3D enhancement : off Loudness : off Mono output : MIX Mic select : Mic1 ADC/DAC loopback : off

0:00 = 6940 0:02 = 1313 0:04 = 8000 0:06 = 801f 0:08 = ffff 0:0a = 9f1f 0:0c = 801f 0:0e = 801f 0:10 = 9f1f 0:12 = 9f1f 0:14 = 9f1f 0:16 = 9f1f 0:18 = 0808 0:1a = 9818 0:1c = 0808 0:1e = 0000 0:20 = 0000 0:22 = 0000 0:24 = 0000 0:26 = 000f 0:28 = ffff 0:2a = ffff 0:2c = ffff 0:2e = ffff 0:30 = ffff 0:32 = ffff 0:34 = ffff 0:36 = ffff 0:38 = ffff 0:3a = ffff 0:3c = 0000 0:3e = 0000 0:40 = 0000 0:42 = 0000 0:44 = 0000 0:46 = 0000 0:48 = 0000 0:4a = 0000 0:4c = 0000 0:4e = 0000 0:50 = 0000 0:52 = 0000 0:54 = 0000 0:56 = 0000 0:58 = 0000 0:5a = 0000 0:5c = 0000 0:5e = 0000 0:60 = 0000 0:62 = 0000 0:64 = 0000 0:66 = 0000 0:68 = 0000 0:6a = 0000 0:6c = 0000 0:6e = 0000 0:70 = ffff 0:72 = ffff 0:74 = ffff 0:76 = ffff 0:78 = ffff 0:7a = ffff 0:7c = 8384 0:7e = 7605