the game boy's envelope hardware has a bug that can be triggered to cause the volume to step up or down only on software command. Furnace uses the same method to trigger it as [LSDJ](https://www.littlesounddj.com/). without this technique, changing the volume directly on a note (such as volume macros do) would cause a phase reset each time, causing significant popping sounds. unfortunately, only a few emulators emulate the "zombie mode" bug properly.
the following options are available in the Chip Manager window:
- **Disable anti-click**: waveform switching requires a phase reset, which may cause clicks. Furnace uses a wave-position predicting algorithm to minimize these clicks. enable this option to disable it.
- **Chip revision**: sets the chip model to use. most of these lack audible difference, but Game Boy Advance fixed the wave channel's inversion.
- **Wave channel orientation**: allows you to set how is wave data written.
- in Game Boy:
- Exact data: wave data is written as-is. it will appear inverted in the output.
- Exact output: wave data is inverted so it appears correctly in the output.
- in Game Boy Advance:
- Normal: wave data is written as-is.
- Inverted: guess!
- **Pretty please**: only for compatibility with Synchronize.dmf. do not use.
