Audacity 2 (Linux)

Tracks Menu

Unmute all tracks

Shift + Ctrl + U

All hotkeys for Audacity 2 (Linux)

Frequently Used
Find zero crossings

Z

Frequently Used
Duplicate selection in new track

Ctrl + D

Frequently Used
Copy selection

Ctrl + C

Frequently Used
Paste selection at cursor

Ctrl + V

Frequently Used
Fit all tracks vertically

Shift + Ctrl + F

Frequently Used
Sort tracks by name

Alt +O,N
Frequently Used
Mute all tracks

Ctrl + U

Frequently Used
Selection tool

F1

Frequently Used
Time Shift tool

F5

Frequently Used
Skip to start

Home

Frequently Used
Skip to end

End

Frequently Used
Play/Pause

Space

File Menu
New

Ctrl + N

File Menu
Open...

Ctrl + O

Edit Menu
Find zero crossings

Z

Edit Menu
Duplicate selection in new track

Ctrl + D

Edit Menu
Copy selection

Ctrl + C

Edit Menu
Paste selection at cursor

Ctrl + V

View Menu
Fit all tracks vertically

Shift + Ctrl + F

Transport Menu
Skip to start

Home

Transport Menu
Skip to end

End

Tracks Menu
Sort tracks...

Alt + O

Tracks Menu
Sort tracks by name

Alt +O,N
Tracks Menu
Mute all tracks

Ctrl + U

Tracks Menu
Unmute all tracks

Shift + Ctrl + U

Tools
Selection tool

F1

Tools
Envelope tool

F2

Tools
Draw tool

F3

Tools
Zoom tool

F4

Tools
Time Shift tool

F5

Tools
Multi-Tool mode

F6

Transport Controls
Play/Pause

Space

Transport Controls
Play current selection looped

Shift + Space

Similar combinations for other applications

Adobe Acrobat Pro (Windows)
Touch Up Reading Order tool (or if already selected, return focus to dialog box)
Tools

Shift + Ctrl + U

Krita Painting 3 (Windows)
Desaturate
Others

Shift + Ctrl + U

PSPad (Windows)
UnIndent Block - UnIndent block
Format

Shift + Ctrl + U

DaVinci Resolve 14 (Windows)
Update Selected Clips
File

Shift + Ctrl + U

SuperMemo (Windows)
View source data of element
129 Shortcuts for SuperMemo (Windows)

Shift + Ctrl + U

InDesign CS5 (Windows)
Underline
Working with Type

Shift + Ctrl + u