For those, who do not need the flexibility of work with audio plug-ins and just want to use their computer as a practice (or live performance) amplifier, Audified have created a new version of their GK Amplification 2 - the precise simulation of Gallien Krueger bass amplifiers.
This standalone only version is available on the Mac App Store and it is priced USD 15.
Apart from the plug-in mode, the Pro version has all the features of regular GK Amplification 2 Pro edition (USD 79) - 3 amps, several cabinets and microphone simulations.
It has a metronome, track player and recorder.
Also the special version of GK Amplification 2 LE is available and it is free on the Mac App Store.
The regular version of GK Amplification 2 Pro and LE are available as standalone versions and plug-ins for AAX, VST and AU on Mac and PC.