docs: updated README.md

README.md

@@ -21,10 +21,13 @@ Arguments:
 Options:
   -b, --buffer <BUFFER>                Size of audio buffer, and width of scope [default: 8192]
   -r, --range <RANGE>                  Max value, positive and negative, on amplitude scale [default: 20000]
-      --no-reference     Don't draw reference line
-      --no-braille       Don't use braille dots for drawing lines
       --scatter                        Use vintage looking scatter mode instead of line mode
       --vectorscope                    Combine left and right channels into vectorscope view
+      --tune <TUNE>                    Tune buffer size to be in tune with given note (overrides buffer option)
+      --sample-rate <SAMPLE_RATE>      Sample rate to use [default: 44100]
+      --server-buffer <SERVER_BUFFER>  Pulseaudio server buffer size, in block number [default: 32]
+      --no-reference                   Don't draw reference line
+      --no-braille                     Don't use braille dots for drawing lines
   -h, --help                           Print help information
   -V, --version                        Print version information
 ```
@@ -41,3 +44,10 @@ To change audio buffer size, the PulseAudio client must be restarted. Because of
 * Use `s` to toggle scatter mode
 * Use `h` to toggle interface
 * Decrease/increase terminal font size to increase/decrease scope resolution.
+
+# 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.
+
+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.