The result seems to me to be more like Reverb in my perception/use. Where the lower it is (like R= 0.5), the more restricted the space is so it bounces around more/intimate and the higher values are more like the room is expanding so its not as bouncy.
What does R refer to or what is it a spectrum from->to? What does the absence and abundance of resonance reify as observably?
And to amend something above. The band of frequencies doesn’t narrow per se as you increase the resonance, but the band of frequencies affected by increased resonance can be adjusted (narrowed or widened) in many filters. You’ll typically see this referred to as the Q factor of the resonated signal.