Adjust the 'lfe balance' value for the specified volume with
* the specified channel map. v will be modified in place and returned.
* The balance is a value between -1.0f (no lfe) and +1.0f (only lfe).
* This operation might not be reversible! Also, after this call
* pa_cvolume_get_lfe_balance() is not guaranteed to actually
* return the requested value (e.g. when the input volume was
* zero anyway for all channels). If no lfe balance value is applicable to
* this channel map the volume will not be modified. See
* pa_channel_map_can_lfe_balance(). Will return NULL on error. \since 8.0
Adjust the 'lfe balance' value for the specified volume with * the specified channel map. v will be modified in place and returned. * The balance is a value between -1.0f (no lfe) and +1.0f (only lfe). * This operation might not be reversible! Also, after this call * pa_cvolume_get_lfe_balance() is not guaranteed to actually * return the requested value (e.g. when the input volume was * zero anyway for all channels). If no lfe balance value is applicable to * this channel map the volume will not be modified. See * pa_channel_map_can_lfe_balance(). Will return NULL on error. \since 8.0