Waveform interpolation order - If you zoom into the waveform so that individual samples become visible, RX will display an upsampled analog waveform as well as the individual digital samples. The interpolation order controls the quality of upsampling. Higher values yield more accurate analog waveforms at the expense of CPU usage.
Frame rate - This sets the frame rate used to draw the time ruler when RX is set to display frames (see View menu or right-click the time ruler to change this setting). Choose from a list of standard frame rates or click in the combo box to define a custom frame rate.
Default full bandwidth paste mode - This controls RX's behavior when pasting a full-bandwidth audio selection. Insert will move aside existing audio, Replace will overwrite existing audio, and Mix will add to existing audio.
Default limited bandwidth paste mode - Similar to the full-bandwidth paste mode, this controls RX's behavior when pasting a limited-bandwidth audio selected.
Show tooltips - when enabled, hovering your cursor above RX features will give you a short description
Offload waveform calculations - When this is enabled, RX's waveform display will be computed in the background. This allows very large files to be loaded very quickly, but it slows down RX's waveform displays.
Show analog waveform - When digital audio is played back, it gets converted to analog. The peak values in the analog waveform can be larger than the peaks in the digital waveform, leading to "analog clipping" which can be problematic in some cases. When "show analog waveform" is enabled, RX will compute an analog waveform in the background. Any peaks will be highlighted in red on top of the existing digital waveform.
Display cursor coordinates in status bar - When this is enabled, the time coordinate of the cursor is shown in the status bar at the bottom of the RX main window. The amplitude of the audio at the cursor position and the frequency at the cursor position is also shown.
Store selections with undo history - When this is enabled, RX will store the selected region in the undo history. When browsing the undo history, the selected region will be restored along with the audio.
Play only selected channels - If only a single channel of audio is selected and this option is enabled, all other channels will be muted during playback.
Floating window opacity - This lets you change the opacity for RX's floating windows. This can be useful if you wish to leave floating windows on top of the spectrogram and waveform without completely obscuring the spectrogram and waveform.