LetiMix has updated GainMatch to version 1.13 adding new features and implementing many user requests.

New Features:

Dark skin added.
Pro Tools support.
More groups (up to 64) and new groups menu.
Target Peak mode.
Match ‘before’ gain to ‘after’.
Listen to ‘delta’.
Fine-tune the difference.
Select gain resolution 0.1dB or 0.01dB.
Improved delay detection, Target Loudness mode, and more…
Video on version 1.1: YouTube.com/watch?v=h5D4OK2VQGc