timeline.lua

--- timeline sequencer
-- aka 'function tracker'

-- out1: pitch
-- out2: volume
-- out3: filter cf

seq = sequins{0,6,11,-12,-1,4,0,0,7,6,4,1}

function make_note()
  output[1].volts = seq()
  output[2]( ar(0.008, 1) )
end
function shift_pitch()
  output[1].slew = 0.1
  output[1].volts = seq()
end
function fsweepup_note()
  output[3].slew = 0.5
  output[3].volts = 5
  make_note()
end
function fsweepdown()
  output[3].slew = 2.0
  output[3].volts = 0
end
function wobble_glissando()
  output[3]( lfo() )
  output[1].slew = 0.1
  output[1].volts = seq()
end
function ratchet3()
  output[2]( times( 3, { to(5,0.07), to(0,0.02) }))
end
function rapid_notes()
  output[1].slew = 0.005
  output[1]( loop{ to( 2, 0.1 ) } )
end

function init()
  output[3].slew = 2
  ii.jf.mode(1)
  ii.jf.run_mode(1)

  clock.run(run_timeline) -- call instantly
end

-- timeline runtime
line = 1 -- track which line is active
function run_timeline()
  local dur = 0
  while timeline[line] do
    dur = timeline[line][1] - dur         -- compare timestamp delta
    if dur > 0 then clock.sleep(dur) end
    timeline[line][2]()                   -- call the action!
    dur = timeline[line][1]               -- grab current timestamp
    line = line +1                        -- next line
  end
end

-- time  -- action
timeline =
{ { 0  , function() end } -- start point (do nothing)
, { 0  , make_note }
, { 0.4, fsweepdown }
, { 1.3, fsweepup_note }
, { 1.8, wobble_glissando }
, { 2.1, shift_pitch }
, { 2.4, ratchet3 }
, { 2.7, wobble_glissando }
, { 3.5, rapid_notes }
, { 4.7, wobble_glissando }
, { 5  , function() line = 1 end } -- jump to start
}