G-Funk Whistle Synth

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I also had a bit of a play around, and came up with a function to control it:

use_bpm 90

define :whistle do |notes, durs, slide=0.1|
  len = durs.reduce(:+)
  s = play notes[0], sustain: len, note_slide: slide
  sleep durs[0]
  notes.zip(durs)[1..-1].each do |n, d|
    control s, note: n
    sleep d
  end
end

use_synth :saw

whistle [:c6, :g6, :f6, :ds6, :d6, :ds6, :d6, :c6, :as5, :c6],
  [0.5, 0.5, 1, 0.5, 0.25, 0.25, 0.25, 0.25, 0.5, 1]

Note that it does use some Ruby things that are not strictly supported by Sonic Pi (like zip and reduce), so it might not continue working in future versions (but could be adapted in that case).

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