Disclojure

A live coding environment for Overtone and Leipzig.

[pjagielski/disclojure "0.1.4"]

Usage

Create a melody using Leipzig:

(require '[repl :refer :all])
(require '[leipzig.melody :refer :all])
(require '[leipzig.scale :as scale])
(def melody
  (->> (phrase [2 1/2 1/2 1/2 2.5 1/2 1/2 1/2 2.5 1/2 1/2 1/2 2.5 1 1]
               [0 -1 0 2 -3 -4 -3 -1 -5 -6 -5 -3 -7 -6 -5])
       (where :pitch (comp scale/G scale/minor))
       (all :part :plucky)
       (all :amp 1)))

Initialize the track state:

(require '[disclojure.live :as l])
(def initial-track
  {:plucky (times 2 melody)})

(defonce state
         (l/reset-track initial-track))

Loop your track forever and change on the fly:

(require '[leipzig.live :as live])
(live/jam (l/track))
(l/assoc-track :plucky (times 2 melody))
(def last-frame (fn [e] (>= (:time e) 12)))
(def remove-last-frame (partial remove last-frame))
(l/update-track :plucky remove-last-frame)

Features

Drum kits

(require '[disclojure.kit :as kit])

Load drum kit from directory:

(kit/load-kit! (io/file "work/beats/big_room"))

Play a drum sound from a kit:

(leipzig.live/play-note {:part :beat :drum :kick :amp 1})

This should play kick.wav from drum kit. See "Track helpers" for details of creating drum patterns.

Sampler

(require '[disclojure.sampler :as samples])

Load samples from directory:

(samples/load-samples! (io/file "work/samples"))

Play a sample:

(leipzig.live/play-note {:part :sampler :sample :loop :bpm 130})

There is a convention of naming samples adopted from Sonic-Pi. Basically, you can include BPM and number of beats in a sample name. So a file named 124_4_worm.wav would be mapped to following structure:

{:bpm 124, :beats 4, :name :worm, :sound #<buffer[live]: ...}

This makes it easy to match sample rate for current BPM of the track. More in the next chapter.

Track helpers

(require '[disclojure.track :refer [tap sampler] :as track)

Making beat patterns with tap:

(def da-beats
  (->>
    (reduce with
            [(tap :fat-kick (range 8) 8)
             (tap :kick (range 8) 8)
             (tap :snare (range 1 8 2) 8)
             (tap :close-hat (sort (concat [3.75 7.75] (range 1/2 8 1))) 8)
             (let [horns [0 1/2 5/4 2]]
               (tap :horn (concat horns
                                  (map (partial + 4) horns)) 8)) ])
    (all :part :beat)))

Basically, tap takes a drum name and a collection of beat times to create a drum pattern. (range 8) will play every beat (kick), (range 1 8 2) - every even beat (snare) and so on.

Sequencing samples with sampler:

(track/sampler [[0 :apache 16 2]
               [(range 0 16 4) :funky-drummer 4 2]
               [(range 0 16 4) :hotpants 4 2]])

The sampler function takes a vector of sample pattern with following structure: [times sample_name beats amp <start_beat>]

• times could be a beat or collection of beats where the sample should play
• sample_name is a name created by load-samples!
• beats is the number of beats to play
• amp is the amplitude of the sample
• optional start_beat allows to play a part of sample from specific point

Custom instruments

Define an Overtone synth and map it to Leipzig live/play-note:

(require '[overtone.live :refer :all])
(defsynth da-funk ...)
(defmethod live/play-note :da-funk [{hertz :pitch seconds :duration amp :amp cutoff :cutoff}]
  (when hertz
    (da-funk :freq hertz :dur seconds :amp (or amp 1) :cutoff (or cutoff 1500))))

License

Copyright © 2016-2019 Piotr Jagielski

The project name refers to Disclosure

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.