Audacity slow-down calculator

*Note: this article is out-dated.  Or, no-worth.  I found that audacity fixed noise problem with tempo change.

If you play music, audacity is an essential tool for many useful things.  Copying music, Ear training, etc.  When slowing down original source using "change tempo", annoying noise mixes with proper output.   I walk two step to avoid noise.  "change speed" and "change pitch".

How much parameter to give to slowdown but no noise, no pitch change is calculated.

#!/usr/bin/env python

import os

import sys

a = raw_input("slow down percent (50% half speed): ")

target_speed = float(a)

target_pitch = ( 100.0 - target_speed ) / target_speed * 100

print "target pitch change: %2.2f" % target_pitch