Reverb Unit
The reverb unit is a non linear but time invariant effect. It is controlled by a singular knob on the amp that controls the amount of reverb and ranges from 1-10, as shown in Figure 1.
Figure 1. Reverb Knob.
In order to estimate the effect of the reverb knob using what we understood in class, we ran a white noise impulse through the reverb unit. We didn't have sufficient hardware to amplify the signal past line level (ideally this signal would be between line and speaker level) so we ran the impulse at line level. Ideally, we would be able to run the IR at different levels and use a lookup table. Because of this limitation, this is just an estimation of what the reverb unit sounds like.
Figure 2. Reverb Impulse Response.
Here we can see that the IR shows a boost in the mid range and a harsh cutoff in the high range frequencies. Below is an example of what the spring reverb sounds like.
Before
After
While this was an estimation of the reverb, we got to practice applying a convolution to the signal in the time domain using an impulse response that we gathered and it still sounded fairly accurate to the spring reverb type timbre that this reverb has.
Video. With and Without Reverb