Giving even finer control over the gain structure, there are two more buttons - Asymmetric and Soft-Clip.
With both knobs at 0, the speaker simulator is completely bypassed (for example, to be used with external impulse loader). In addition to the basic controls, there are two more knobs that control the speaker simulator parameters - Shape and Rolloff. It gives the most accurate digital representation, compared to cascaded filter/static waveshaper approach. See the EQ plot in the bottom right corner for details.Īll stages are modeled as nonlinear filters with their outputs depending on both the frequency and the amplitude of the input signal. Each overdrive stage has a distinct frequency shaping quality according to their names. They are followed by tonestack, speaker simulator and an output level control. First three are based on op-amps with zener diodes in the feedback chain, while the last two are just op-amps being overdriven into saturation. SoftAmp PSA is a virtual-analog guitar pre-amp supplemented with noise gate and compressor, all modeled after famous guitar gear that needs no introduction.Īt its core there are 5 distortion stages.
