Function openmpt_module_get_current_channel_vu_left 

pub unsafe extern "C" fn openmpt_module_get_current_channel_vu_left(
    mod_: *mut openmpt_module,
    channel: i32,
) -> f32

\brief Get an approximate indication of the channel volume on the front-left speaker.

\param mod The module handle to work on. \param channel The channel whose volume should be retrieved. \return The approximate channel volume. \remarks The returned value is solely based on the note velocity and does not take the actual waveform of the playing sample into account.