ctford / cljs-bach Goto Github PK

This relates to the issue I opened in klangmeister repo
Please refer description there.

Per https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#webaudio , AudioContext will not be granted until user has done some interaction with the site. So how do we create it?

I noticed in the pure-JS HTML example there is a function called sample:

https://github.com/ctford/cljs-bach/search?utf8=%E2%9C%93&q=sample

I would love to know more about what is possible with this.

In the adsr function, the remainder for the hold is calculated by subtracting the attack, decay, and sustain from the duration. I think this should be attack, decay, and release instead, as those are the adsr time parameters, and sustain is a level parameter.

https://github.com/ctford/cljs-bach/blob/master/src/cljs_bach/synthesis.cljs#L92

I'm really enjoying using this library along with leipzig for web-based music generation, they're really great.

I was wondering if there was any recommended pattern for updating an AudioParam of a node that is part of a synthesizer? For example, I would like to be able to bind the gain parameter of a gain node to some dynamic value based on a slider from an <input type="range"> element:

(defn ping [freq]
  (connect->
    (square freq)
    (percussive 0.01 0.4)
    (gain dynamic-value-here?)))

I've been trying various approaches involving calling AudioParam.setValueAtTime() from an event listener and using an AudioBufferSourceNode to provide a changing value to other nodes, but nothing I try seems to work correctly.

If work is required to the library to be able to support something like this, I'd be happy to help out if I can.

paste from cljs.bach.synthesis:

(defn oscillator
  "A periodic wave."
  [type freq]
  (fn [context at duration]
    (source
      (doto (.createOscillator context)
        (-> .-frequency .-value (set! 0))
        (-> .-frequency (plug freq context at duration))
        (-> .-type (set! type))
        (.start at)
        (.stop (+ at duration 1.0)))))) <----- here

If I create an oscillator like this

(oscillator "sine" another-synth)

the extra second added (see the "here" mark) need to be added to another-synth, is this really wanted?