SoftAmp GT Free VST guitar amplifier plugin effect

SoftAmp GT guitar amplifier

SoftAmp GT is a free VST virtual emulation of a well-known analog guitar amplifier simulator stomp-box. The prototype is a solid state circuit that uses op-amps to saturate the signal and moderate filtering to shape the tone throughout the signal path. The speaker simulation is achieved by a steep low-pass filter as well as some middle-frequency manipulation to resemble different microphone positions. All controls of the original device are faithfully reproduced in this plug-in in addition to some unique ones described below.

AMP – general amplifier family :

  •     Tweed – classic American clean-sound amps.
  •     British – crunch and moderate gain.
  •     California – modern hi-gain amp with a deep low-end.

MOD – gain structure of the amplifier :

  •     Clean.
  •     Hi-gain.
  •     Hot wired (same as hi-gain but with a high-freq boost).

MIC – virtual microphone position :

  •     Classic – far from the speaker.
  •     Center – the most bright setting.
  •     Off-axis – slightly offset microphone that provides smoothed high-freq response.

The original stomp-box was somewhat criticized for having a symmetrical hard-clipping saturation and there were a lot of attempts to modify the circuit to provide smoother tube-like sound by the community. Variations included using different op-amps and using a bipolar transistor to introduce the asymmetrical clipping. This plug-in takes this concept further by introducing a special control :


CLIP – clipping mode :

  •     Normal – standard hard-clipping modeled after the TLC2262 op-amp.
  •     Soft – abstract symmetric soft-clipping stage.
  •     Triode – virtual 12AU7 triode stage.

The most interesting is the Triode setting. It effectively replaces every op-amp in the circuit with a triode stage accurately modeled using the same engine used in the SoftAmp 3OD plug-in. It will perform asymmetric soft-cliping with dynamic behaviour that depends on the tube overdrive level that will produce a moderate amount of even harmonics. The overall difference is subtle, but it’s there. A good test would be listening to the effect applied to the sinusoidal input.


Info & Download >>soft-amp / SoftAmp GT

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