We've been developing a virtual guitar tube amp designer able to emulate each stage of a tube guitar amp, allowing multiple configurations inspired by existing hardware amps. We also created or adapted a large set of FX pedals. Finally, we wrote a pedal board host application that mimic a real guitarist pedal board, that can assemble in a graph the amp simulators, the FX pedals but can also accept virtual instruments.
We did blind tests with professional guitarists. We made them play on our WebAudio simulations and also on native simulations of similar amplifiers. The results show that we are up to native simulations in terms of sound quality, timbre, dynamics, and more generally of playing comfort. For example, our simulations have been much better evaluated than those of GarageBand. The latency on Mac OS is comparable to the best native apps, and not felt by the testers.
Here are some screenshots: guitar tube amp designer : https://imgur.com/a/HsT7G58, pedalboard webapp: https://imgur.com/a/5iZzvI7, online plugin tester: https://imgur.com/a/N08H7YT, online repository tester: https://imgur.com/a/eqr2o1d
Videos: guitar amp simulators: See it https://youtu.be/-NdMdJQx2Bw or https://www.youtube.com/watch?v=PiOD7n3g-Qs, pedalboard: https://www.youtube.com/watch?v=elbjh6tBK6U&t=71s