# output regs
alias $out_vol,    %30
alias $out_pitch,  %31

# input regs
alias $revs,       %0

# transient regs
alias $vol_diff,   %10
alias $vol_target, %11
alias $vol_cur,    %12
alias $last_revs,  %13

# locals
alias $vol, %14
alias $eng_speed, %15

# engine volume
sub   $vol_diff, $last_revs, $revs
add   $vol_target, 0.3, $revs
clamp $vol, $vol_target, 0.2, 1.0
clamp $vol_target, $vol_target, 0.0, 1.0

#sub %20, $vol_target, $vol_cur
#mul %20, %20, 0.5
#add $vol_cur, $vol_cur, %20

mov  $vol_cur, $vol_target
madd $out_vol, $vol_cur, 0.5, 0.7
#mov $out_vol, 1.75

# engine pitch
div  $eng_speed, $revs, 1.0
madd $out_pitch, $eng_speed, 0.25, 0.8
#div  $out_pitch, $out_pitch, 1.1