Polarity has released GXStack, a VST tube modelling guitar effects processor for Windows which includes six custom guitar amplifier models and essential guitar effects. GXStack is a zero-latency, "highly efficient" implementation with minimal CPU overhead, and is thus suitable for real-time, live use. Polarity claim that GXStack "emphasizes tonal quality, reliability and simplicity".

Features:

• 6 Custom Amp Models with controls for Gain, Bass, Mid, Treble, Output Level and Reverb:
  1. Tweed Boy
  2. Deluxe 30
  3. CrunchTone
  4. Overdrive Custom
  5. Bulldog 100
  6. VT MetalHead
• Super-smooth Chorus and Delay

Additional GXStack amp models will be available for purchase.

GXStack costs US$39.99 (introductory pricing) and a demo version is available.