Bismark updates bs-1, bs-16 and bs-spectrum

Bismark has updated bs-1 and bs-16 to v4.0 beta 3 and bs-spectrum to v1.3 beta 2.

bs-1 / bs-16 changes:

• [VST] Fixed some GUI issues.

bs-spectrum changes:

• [VST] Supported VST 2.4 rev2 SDK.