Also send output to a new file vs just speaker

[duysqubix]

Hello, I have example from https://github.com/faiface/beep/wiki/Composing-and-controlling

	for {
		fmt.Print("Press [ENTER] to pause/resume. ")
		fmt.Scanln()

		speaker.Lock()
		ctrl.Paused = !ctrl.Paused
		volume.Volume += 0.5
		speedy.SetRatio(speedy.Ratio() + 0.1) // <-- right here
		speaker.Unlock()
	}

working nicely. My question is, can I also send the output to a NEW mp3 file on disk with all the pauses (added silence) and the speed increases as the user controls them? That is they play the original source.mp3 file (say it's 1 minute long) and hit pause as they like, and speed it up, slow it down etc. and the end result is 2 minutes of audio played through the speaker. Can I have that 2 minute of new audio as a new mp3 file?

Original issue: faiface/beep#150

[MarkKremer]

Answered in original issue.