Custom multiplier for playback speed

[iamayod]

Describe the feature request

Add an option to have a custom multiplier for playback speed.

This would ensure users can use 1.10x or 1.15x for music playback. The jump from 1.0 to 1.2x is too harsh for higher BPM tracks.

Post Requisites

• I have checked that a similar feature request has not been reported before.
• Verified the relevance of the project and the version you are using.
• Provided a detailed description of the request and have filled in all required fields.
• I did not answer truthfully to ALL the above checkboxes.
• By submitting this request, I confirm that I have filled in all the necessary fields and complied with the guidelines. Failure to comply may result in the request being closed without discussion, and repeated violations may lead to restrict account from further participation.