Speed up playback 1.1 to 1.5x

[mark_intelliserve.co.nz]

Hello, I'll like to speed up play back to 1.1 to 1.5x Is this something that can be considered please.

[gveres]

This feature request seems to be a subset of this one:

Feature Request: Playback Speed

I would invite Mark and @jkiel to go "like" this linked feature request.