Main Window

The main window seen above houses all of Fission's main settings. From here, all of Fission's primary controls can be accessed.
Fission's Modes
Fission has three distinct modes for affecting audio files, selectable from the toolbar at the top of Fission's window.

Inspect Mode
When in Inspect Mode, you can examine clips and files. Select audio to be played back or adjusted with the Inspector.
Select Mode
Use Select Mode to select portions of audio. This audio can then be cropped around, cut, or faded.
Split Mode
Split Mode is used to insert Split Points into the file. When the audio is then saved, each split point will cause a separate file to be created.
Editing Controls
Fission's Editing controls enable you to remove and adjust audio as described below.

Remove
Clicking Remove will remove the selected audio.
Remove & Split
Remove & Split will remove the selected audio, and leave a split point. This will create two clips and two files when the audio is saved.
Crop
Crop removes all the audio outside of the current selection, leaving only the selected audio.
Fade In
Fade In will fade audio in over the entire selection, ramping up the volume to the end of the selection.
Fade Out
Fade Out will fade audio out over the entire selection, ramping down the volume to the end of the selection.
Normalize
Normalize will increase the gain of the entire selection, so that the loudest sample is at the maximum possible value. Simply put, this makes the selection as loud as possible without causing distortion.
Control Buttons
The Inspector button toggles the visibility of the Inspector. The Save Audio button opens the Save dialog to save the audio out.

Main Editing Area
Fission's main editor consists of two waveforms showing your audio visually. The top waveform shows the entire file at once, while the bottom provides a larger, zoomed-in view.

Above you can also see the read playhead, showing where audio is playing, as well as the two rulers (on the top and the bottom) showing the timestamps.
The Gain Adjust controller (shown above) can be whenever audio is selected. Click this, then drag the slider up and down to adjust gain of the selected audio.

To adjust the zoom level of the main waveform, use the zoom slider. Clicking the - or the + buttons on the end will zoom out or in by one step, respectively.

Playback Controls
When playing audio in Fission, you can control playback with these controls.

The timer wells show the time elapsed and time remaining. Use the rewind, play/pause, and fast forward controls to move the playhead, and the volume control to adjust the output volume during playback.