What are alternate UI/UX for Knobs?

I'm working on UI/UX which has mainly On knobs. I'm thinking to keep alternative for knobs. What are suitable alternative for knobs (Other than sliders).

For example The figure below shows Two knobs Where outer point gives the whole number part (eg- 2) and inner point shows the fraction part (eg- .45) and the output is 2.45

Example Knob

Now I'm thinking the alternate UX instead of Knobs. Please suggest me the tags for this. I'm new bee for this.

Adv Thanks for inputs.

Edit 1:

This is for desktop music app.. Knobs here are used for frequency change,volume control,Format value set, time span (min:1s Max:10s), etc.

And the output is displayed in text box as the knob moves(with mouse/hand(in touch panels))

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