I'm new to AudioKit and am using v5. The oscillator frequency ramp doesn't seem to work as expected. The following example has 2 successive ramps. First it ramps 440-880, but then sounds like it goes 880-660 instead of 440-660.
If I comment out osc.$frequency.ramp(to: 660.0, duration: 1.0), it ramps 440-880, then ramps extremely quickly to 440 but gets there.
Seems like something isn't resetting after the ramp.
(The sleeps are only for testing.)
Is this a bug? Is there something else I should be doing? Any insight would be much appreciated! Thanks!
import Cocoa
import AudioKit
class Test {
let akEngine = AudioEngine()
let osc = Oscillator()
func setup() {
osc.amplitude = 0.1
akEngine.output = osc
do {
try akEngine.start()
} catch {
print("Couldn't start AudioEngine.")
}
osc.frequency = 440.0
osc.start()
osc.$frequency.ramp(to: 880.0, duration: 1.0)
sleep(2)
osc.stop()
sleep(1)
osc.frequency = 440.0
osc.start()
osc.$frequency.ramp(to: 660.0, duration: 1.0)
sleep(2)
osc.stop()
}
}
This probably deserves an explanation, or maybe it should be fixed to work as you have it above, but once you start automating changes, you should stick with the automation syntax and not jump out to plain setting of values. For you this means just replacing osc.frequency = 440 with osc.$frequency.ramp(to: 440.0, duration: 0.0) and I believe you will get the effect you want.