AB Assist 2 Upgrade from AB Assist 1: Audio Comparison Tool by NUGEN Audio

Version 2 can receive and compare four audio sources, where the original workflow was limited to fewer inputs. Surround mixes can be compared in any channel count, so multichannel material is not restricted to stereo.

Auto-level-match adjusts sources to match their short-term loudness measured in LUFS. This helps remove the volume difference that often makes one version sound better simply because it is louder. Smooth fades between sources make switching less abrupt, and the mono-check option lets you hear how a mix collapses to mono.

The test mode labels channels randomly, which is useful when you want an unbiased decision about which version works best. Multiple plug-in instances communicate directly with each other, so you do not need to set up an external send to compare plug-in options.

The developer describes the tool as helping you work more quickly and accurately, and it can become a regular part of mixing or mastering.