Sequencer Implementation

[jmidt]

Sequencer

The sequencer controls the 8 samplers. When editing the sequencer steps, the musical keyboard keys change to change sampler (black keys) and edit steps (white keys). Features are below, with those already implemented marked with a check mark.
GFI marks something suitable for a newcomer to get started on.

• Tempo (controls global clock)
• Start/stop (controls global clock)
• Sequencer screen
  • Per-trigger settings
    • 3. conditional trigs
      • Chance / 2 in 4 etc
      • Draw 2 in 4 as ○ ● ○ ○
      • Single encoder, turn CW for X in Y, CCW for chance
    • 2. velocity
    • parameter locks?
  • Global
    • 1. Tempo / swing
    • 4. Sequence length
• Elegant solution for substeps
  • Ratchets/Retriggers?
  • Finite list of selectable combinations
  • Full access to individual substeps with led "zoom"
• Move file handling out to the Sequencer, from the individual Samplers.
• Mutes
• 5. Sends for samplers
  • Sampler objects own their own Sends
  • Sequencer::sends_screen() to get
• 6. Variations
  • 1 base sequence, 4 variations, of which zero or one can be active at any time
  • variations are "diffs", i.e. only contain changes to the base sequence, not a copy of the base sequence
  • variations can be
    • queued for the next "round" (click)
    • switched on instantly and held with a momentary switch (shift + click)
    • queued and enabled for all future rounds
    • switched on instantly and kept on
  • step-toggles in variations have three states: on, off, "as in base"
• Future extensions:
  • Longer sequences than 16 steps.
    • Pages? +/- could be reused to switch pages
  • GFI Long press (or press and encoder turn) does not toggle step
  • Choke groups
  • Mute groups
  • Parameter locks
    • Only sampler and sends props need to be lockable
  • Velocity view - view velocity on LEDs.

Global clock

• Count microsteps (192?) with an unsigned int
• clock range in ProcessData (last time, current time)
• check if the desired step is in clock range
• Sent from engine manager
• Control through separate ClockManager
  • void start(), void stop(bool reset = true), void reset()
  • float bpm()
• Future extensions
  • "Subscribe" to clock "events", i.e. handle every 16th etc.
    • Done by checking data.clock.contains_multiple, data.clock.count_multiple and data.clock.position_of_multiple
  • GFI swing

[jmidt]

I added a small point about switching to a sampler track automatically when pressing either sequencer or sampler button.

[jmidt]

Added a point about the file handling. This should be done in the sequencer.