Bulk scale kerning

I have set the kerning (and manually created a bunch of kerning pairs) and I am now realizing that it all looks as if it is letterspaced. Is it possible to scale all the kerning on every glyph so that it will reduce the kerning for each group & pair evenly?

Thanks!

Are you sure you mean kerning. I suspect that you mean spacing? Have you read this: https://glyphsapp.com/tutorials/spacing

thank you!