I've learned some NES development and decided to build a testing application to verify the resistor used with the NES sound mod.
This is also my first open source project, yeah!
The sound level was evaluated using the emulator nestopia as It seemed to have high hardware compatibility.
Strangely enough I can't find a reliable source of the proper ratio between APU and VCR6 volumes. So all I can do is to rely on nestopia.
FamiTracker for example has exactly the same volume for a maximum level pulse wave of both sound chips.
If everyone out there decides that I'm wrong with this program please don't hesitate and contact me.