furnace/doc/8-advanced/chanosc.md

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# oscilloscope (per-channel)
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the "Oscilloscope (per-channel)" dialog shows an individual oscilloscope for each channel during playback.
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![oscilloscope per-channel configuration view](chanosc.png)
right-clicking within the view will change it to the configuration view shown above:
- **Columns**: arranges oscilloscopes into this many columns.
- **Size (ms)**: sets what length of audio is visible in each oscilloscope.
- **Center waveform**: does its best to latch the waveform to the channel's note frequency and centers the display.
- **Amplitude**: scales amplitude for all oscilloscopes.
- **Gradient**: see below.
- the color selector sets the color for all waveforms. right-clicking on it pops up an option dialog:
- select between the square selector and the color wheel selector.
- **Alpha bar**: adds a transparency selector.
- the boxes below that are for selecting colors numerically by red-green-blue-alpha, hue-saturation-value-alpha, and HTML-style RGBA in hex.
- **Text format**: this string determins what text is shown in the top-left of each oscilloscope. it can be any text, and the following shortcodes will be replaced with information about the channel:
- `%c`: channel name
- `%C`: channel short name
- `%d`: channel number (starting from 0)
- `%D`: channel number (starting from 1)
- `%i`: instrument name
- `%I`: instrument number (decimal)
- `%x`: instrument number (hex)
- `%s`: chip name
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- `%p`: chip part number
- `%S`: chip ID
- `%v`: volume (decimal)
- `%V`: volume (percentage)
- `%b`: volume (hex)
- `%%`: percent sign
- The OK button returns from options view to the oscilloscopes.
## gradient
![oscilloscope per-channel gradient configuration view](chanosc-gradient.png)
in this mode, the color selector is replaced by a square field onto which circular "stops" can be placed. each stop adds a soft circle of color. the resulting image is used to look up the oscilloscope color as determined by each axis.
- right-click to place a stop.
- left-click on a stop to change its color. the color selector is the same as above, with two additions:
- **Distance**: the size of the circle.
- **Spread**: the size of the solid center of the circle. increasing it fills more of the circle with the target color.
- **Background**: sets background color for entire field.
- **X Axis**: determines what the horizontal maps to, from left to right.\
**Y Axis**: determines what the vertical maps to, from bottom to top. these can be set to the following:
- **None (0%)**: stays at the left or bottom.
- **None (50%)**: stays at the center.
- **None (100%)**: stays at the right or top.
- **Frequency**: changes color with note frequency.
- **Volume**: changes color with volume.
- **Channel**: changes color based on channel number.
- **Brightness**: {{document this}}
- **Note Trigger**: changes color when a new note is played.