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update settings.md

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doc/2-interface/settings.md
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# settings
settings are saved when clicking the **OK** or **Apply** buttons at the bottom of the dialog.
the Settings window allows you to change Furnace setting.
settings are saved when clicking the **OK** or **Apply** buttons at the bottom of the window.
## General
### Program
- **Render backend**: changing this may help with performace issues.
- **Render backend**: changing this may help with performace or compatibility issues. the available render backends are:
- OpenGL 3.0: works with the majority of graphics chips/cards (from 2010 onwards). default on Linux.
- OpenGL 2.0: use if you have a card without OpenGL 3.0 support.
- OpenGL 1.1: use if your card doesn't even support OpenGL 2.0.
- DirectX 11: works with the majority of graphics chips/cards and is optimized specifically for Windows.
- SDL Renderer: this was the only available render backend prior to the addition of dedicated OpenGL/DirectX backends in 0.6. default on macOS.
- it is slower than the other backends.
- **Render driver**: this setting appears when using the SDL Renderer backend. it allows you to select an SDL render driver.
- **VSync**: synchronizes rendering to VBlank and eliminates tearing.
- **Frame rate limit**: allows you to set a frame rate limit (in frames per second).
- only has effect when VSync is off or not available (e.g. software rendering or force-disabled on driver settings).
- **Late render clear**: this option is only useful when using old versions of Mesa drivers. it force-waits for VBlank by clearing after present, reducing latency.
- **Power-saving mode**: saves power by lowering the frame rate to 2fps when idle.
- may cause issues under Mesa drivers!
- **Disable threaded input (restart after changing!)**: processes key presses for note preview on a separate thread (on supported platforms), which reduces latency.
- however, crashes have been reported when threaded input is on. enable this option if that is the case.
- **Enable event delay**: may cause issues with high-polling-rate mice when previewing notes.
- **Per-channel oscilloscope threads**: runs the per-channel oscilloscope in separate threads for a performance boost when there are lots of channels.
- **Oscilloscope rendering engine**: allows you to select between the following rendering engines for oscilloscope views (master and per-channel):
- **ImGui line plot**: the default engine. uses Dear ImGui line plotting functions for rendering.
- **GLSL**: uses OpenGL shaders for rendering. higher quality, but very GPU-intensive! only available in OpenGL 3.0 backend.
### File
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all of these are covered in the [guide to choosing emulation cores](../9-guides/emulation-cores.md).
### Quality
some chips have output quality settings. these may be used to increase quality or lower CPU usage.
the available quality settings are:
- Lower: fastest but worst quality.
- Low
- Medium
- High: the default quality.
- Ultra
- Ultimate: highest available quality. may be very CPU heavy!
### Other
- **PC Speaker strategy**: this is covered in the [PC speaker page](../7-systems/pcspkr.md).
## Keyboard
### Keyboard
- **Import**
- **Export**
- **Reset defaults**
- **Import**: imports keyboard layout in `.cfgk` format.
- **Export**: exports keyboard layout in `.cfgk` format.
- **Reset defaults**: resets all keybinds to default values.
a list of keybinds is displayed.
- click on a keybind. then enter a key or key combination to change it.