Effects are not scoped to their clip in a channel

[qchenevier]

Using this example:

const session = new scribble.Session();
const effect = new Tone.AutoWah({Q: 6}).toDestination()
const effect2 = new Tone.AutoFilter().toDestination()
session.createChannel({
  instrument: "Synth",
  clips: [
    { pattern: 'x____x____', notes: 'C3 C3', effects: effect },
    { pattern: 'x____x____', notes: 'C3 C3', effects: effect2 },
    { pattern: 'x____x____', notes: 'C3 C3' },
  ],
});

The 3 clips are the same, they all have both effects applied, even the 3rd clip here which should be without an effect.

Note: Here, I connect manually the effects to Destination, using toDestination(), due to #119 but that needs to be fixed. So in offline rendering, in this case, no effects are applied at all !