Here is the V1 of the list. It follows the structure of the manual, so for more details just copy-paste titles and do a search in the PDF manual.
I think it needs to be simplified and made shorter but I’ll see later when I have time for the V2 of the list. Please let me know if something is wrong or something is missing and I’ll update the list.
For experienced users, do not forget to use the Help key (shift+0 or long-press 0). Almost everything is already written in these help screens.
For new users, I’ll hope you’ll find this thread useful 
HELP
Shift+0: Display Help screen.
Editing a Text Field
Shift+Arrows/Encoder: Move the cursor to the beginning or end of the field.
During editing, Shift+Arrows/Encoder scroll to the beginning or end of the alphabetic characters.
Tabbing
Shift+Enter or Shift+Encoder: back-tab (e.g. in Sampling, Pan, Waveform Editor, Envelope Editor)
Holding down Enter or the Encoder while pressing the Arrow keys or turning the Encoder also tabs forward and backward between fields.
Browsing Files and Folders
Shift+Arrows/Encoder: Scrolls to the first or last file.
Shift+Back: Goes up one folder level.
Assigning Sounds to Tracks
Shift+Pad: Displays Track Settings
Playing Patterns
Shift+Run/Stop:
●When stopped, Shift+Run/Stop continues playing from the point at which the pattern was stopped.
●When running, Shift+Run/Stop restarts the pattern at the beginning. If the pattern number has been changed, but the current pattern is still playing, Shift+Run/Stop immediately starts the new pattern.
●When using an external clock source, Shift+Run/Stop forces the pattern to play even if no external clock is being received. Or, forces the pattern to stop if it is already playing.
Recording Patterns
Rec/Edit+Run/Stop: To begin recording, hold the Rec/Edit key then press the Run/Stop key.
Pattern Tempo
Shift+Arrows/Encoder changes the tempo in 0.1 BPM increments.
Shift+Tempo: Toggles global tempo or pattern-specific tempo for the current pattern.
Repeat
Tap/Repeat+Pad: Hold the Tap/Repeat key while pressing a pad to repeat the track.
Shift+Tap/Repeat: Locks repeat mode. Press and release Tap/Repeat to unlock repeat.
Pattern Mode Keys
Shift+A: Displays the parameter settings for the current fader mode.
Shift+B: In Mix, Level, or Pitch fader mode: Filter settings.
In Envelope mode: Switch envelope.
In Loop/Slice mode: Toggle looping
Pattern Mode Keys
A+Pad: Shortcut to Modify Pattern.
B+Pad: In Mix, Level, or Pitch fader mode: Shortcut to Modify Pattern for the filter.
Shift+Bank: Goes to the previous bank.
Bank+Number Key: Goes directly to a bank (Bank+1 for A, Bank+2 for B, etc.)
Shift+Back: Stops all sounds in any mode.
If the current bank is a MIDI bank, Shift+Back does a “MIDI panic” and sends an all notes off CC
message, and a note off message for every note, on all of the ports and channels that have MIDI
tracks.
Back+Pad: Resets all sound parameters (level, pitch, filters, etc.) to their defaults for that track.
In Multi Mode, Back+Pad resets that track’s multi parameters for the current fader mode
(pitches, slices, etc.).
Erase+Pad: Quick erase the track from the current pattern, or selectively live-erase events.
Copy+Pad: Select a pad to copy. Continue holding copy, then press the destination pad. In Multi
Mode, the same action copies parameters from one multi pad to another.
Copy+Back: Undo/Redo
Copy+Enter: Set manual undo point
Copy+0 (zero): Cancel manual undo point
FADER MODES
Shift+fader:
● If the faders are locked, holding Shift while moving a fader will modify the parameter
● If the faders are not locked, holding Shift moves the fader without modifying the parameter.
Parameter Settings
Shift+A: Displays the parameter settings for the current fader mode.
Shift+B: Displays the filter settings when in Mix, Level, or Pitch fader mode.
In Envelope mode: Switch envelope.
In Loop/Slice mode: Toggle looping.
A+Pad: Shortcut to Modify Pattern
B+Pad: Shortcut to Modify filter
Envelope Fader Mode
Shift+A: Displays envelope settings
Switching Envelopes
Shift+B: Switches between envelope 1 and envelope 2, and the classic envelope if it is enabled
for the track.
Loop/Slice Fader Mode
Shift+A: Displays slice settings
Shift+B: Turn on looping.
Waveform Editor
Shift+A: Displays slice settings
Shift+B: Turn on looping.
Back+Pad: Reset the points to where they were when the editor was first displayed.
Shift+fader:
● If the faders are locked, holding Shift while moving a fader will modify the parameter
● If the faders are not locked, holding Shift moves the fader without modifying the parameter.
Shift+Enter or Shift+Encoder: back-tab. Holding down Enter or the Encoder while pressing the Arrow keys or turning the Encoder also tabs forward and backward between fields.
Shift+Arrows/Encoder: Always scrolls the screen no matter which field is selected (when zoomed in)
Metronome
Double click: Quickly double-clicking the Metronome key toggles the metronome on/off for the current mode.
Swing
Swing key+arrows/encoder: Changes the pattern’s swing setting in pattern mode
Swing key+ pad + arrows/encoder+pad: Changes an individual track’s swing in pattern mode.
Quick-Erase Track
Erase+Pad: (hold Erase, then press a pad) erases the entire track from the current pattern
without having to go to the erase menu.
In Multi Mode, Erase+Pad erases only pattern events recorded with that multi pad.
Live-Erase Events
While recording, holding Erase+Pad removes events from the pattern as the track is played in the pattern.
Quantize
Quantize+arrows/encoder: Changes the default quantize setting in pattern mode.
Quantize key+ pad + arrows/encoder+pad: Changes an individual track’s quantization in pattern mode.
STEP PROGRAM
Shift+Run/Stop: Play from the current cursor position
Erase+Pad: Removes events from the pattern at the cursor position or in the selection.
Erase+Enter/ Erase+Encoder Press: Removes all events from the pattern at the cursor position.
F4+Pad: Shift one track’s events under the cursor or in the selection
Shift+Encoder/Enter: Selects the pattern number.
Select and Copy
Shift+ Encoder/arrows: select an area of the pattern.
Erase+Enter/ Erase+Encoder Press: Removes all events from the selection.
Erase+Pad: Erase one track’s events from the selection
Copy+Pad: Copy one track’s events from the selection (or under the cursor) to the clipboard.
Shift
F4+Pad: Shift one track’s events under the cursor or in the selection
TR Mode
Shift+Mute/Solo: Display Edit Step Parameters for that step, if there is an event there.
Edit Step Parameters
Shift+Enter or Shift+Encoder: back-tab. Holding down Enter or the Encoder while pressing the Arrow keys or turning the Encoder also tabs forward and backward between fields.
Mute/Solo
Mute/Solo Undo/Redo
•Shift+any mute button: If any tracks are muted, un-mutes all tracks.
•Shift+any mute button: If no tracks are muted, re-mutes what was previously un-muted.
•Shift+any solo button: If any tracks are soloed, un-solos all tracks.
•Shift+any solo button: If no tracks are soloed, re-solos what was previously un-soloed.
LIVE LOOPING
Shift+Pad: Displays Live Loop settings and functions.
Erase+Pad: Erase one of the Live Loops.
Shift+Mute/Solo: Turn the Live Loops on and off using the opposite of the immediacy setting for that Live Loop.
SONG MODE
Shift+Run/Stop: When no song is playing: start the song from the selected step.
SYNC
Clock Source
Shift+Run/Stop: Force the S2400 to run.
Run/Stop+Rec/Edit: Arm the record function
Shift+Run/Stop+Rec/Edit: Force the S2400 into record mode.
Sample Mode Keys
Shift+Enter or Shift+Encoder: back-tab. Holding down Enter or the Encoder while pressing the Arrow keys or turning the Encoder also tabs forward and backward between fields.
MIDI Track Settings
Shift+Pad: Display MIDI Track Settings
BONUS
Shift+Back+Enter: Reboot
Shift+Song: screen capture
Shift+99 in Settings : Brad’s Christmas Egg 
Shift+@!#?@! : PONG 
