Surround sound control parameters
| Parameter | Description | Allowed Value | Default Value |
|---|---|---|---|
| lfe_surround | Low-Frequency Effects | yes, no | none |
| lowpass_filter | Lowpass filter for the LFE channel | yes, no | none |
| surround_mode | Dolby Surround mode | not_indicated, yes, no | none |
| surround_mode_ex | Dolby Surround EX mode | not_indicated, yes, no | none |
| surr_shift | Surround 90 degree phase shift | yes, no | none |
| surr_attenuation | Surround -3dB attenuation | yes, no | none |