The main mixer is the final mixer that all sound passes through. This fn resets it to its default set - undoing any changes made via set_mixer_control!

Introduced in v2.9

Example

# Example 1

set_mixer_control! lpf: 70
sample :loop_amen         
sleep 3
reset_mixer!              
sample :loop_amen

# LPF cutoff value of main mixer is now 70
# :loop_amen sample is played with low cutoff
 
# mixer is now reset to default values
# :loop_amen sample is played with normal cutoff