docs: update readme

README.md

@@ -24,30 +24,42 @@ Options:
       --scatter                Use vintage looking scatter mode instead of line mode
       --vectorscope            Combine left and right channels into vectorscope view
       --tune <NOTE>            Tune buffer size to be in tune with given note (overrides buffer option)
+      --channels <N>           Number of channels to open [default: 2]
       --sample-rate <HZ>       Sample rate to use [default: 44100]
       --server-buffer <N>      Pulseaudio server buffer size, in block number [default: 32]
+      --triggering             Start drawing at first rising edge
+      --threshold <THRESHOLD>  Threshold value for triggering [default: 0]
       --no-reference           Don't draw reference line
+      --no-ui                  Hide UI and only draw waveforms
       --no-braille             Don't use braille dots for drawing lines
   -h, --help                   Print help information
   -V, --version                Print version information
 ```
 
-The audio buffer size directly impacts resource usage, latency and refresh rate and its limits are given by the audio refresh rate. Larger buffers are slower but less resource intensive. A good starting value might be `8192`
+The audio buffer size directly impacts resource usage, latency and refresh rate and its limits are given by the audio refresh rate. Larger buffers are slower but less resource intensive. A good starting value might be `8192` or tuning to the 0th octave.
 
 To change audio buffer size, the PulseAudio client must be restarted. Because of this, such option is configurable only at startup.
 
 ## Controls
 * Use `q` or `CTRL+C` to exit
 * Use `<SPACE>` to pause and resume display
-* Use `-` and `=` to decrease or increase range (`_` and `+` for smaller steps)
+* Use `<LEFT>` and `<RIGHT>` to decrease or increase range by 100
+* Use `<UP>` and `<DOWN>` to decrease or increase threshold by 100
+  * Combine arrows with `<SHIFT>` to increase or decrease by 1000 instead
+  * Combine arrows with `<CTRL>` to increase or decrease by 10 instead
+  * Combine arrows with `<ALT>` to increase or decrease by 1 instead
 * Use `v` to toggle vectorscope mode
 * Use `s` to toggle scatter mode
+* Use `b` to toggle braille characters
 * Use `h` to toggle interface
-* Decrease/increase terminal font size to increase/decrease scope resolution.
+* Use `r` to toggle reference lines
+* Use `t` to toggle triggered mode
 
 # About precision
-While "scatter" mode is as precise as Pulseaudio and the terminal lets us be, "line" mode simply draws a straight line across points, meaning high frequencies don't get properly represented.
+While "scatter" plot mode is as precise as Pulseaudio and the terminal lets us be, "line" plot mode simply draws a straight line across points, meaning high frequencies don't get properly represented.
 
 Latency is kept to a minimum thanks to small buffer and block sizes.
 
 Sample rate can be freely specified but will ultimately be limited by source's actual sample rate.
+
+Decrease/increase terminal font size to increase/decrease scope resolution.