fair enough; I think what you mean is the baritone's chorus feedback self oscillating there a little... resonating in the low-mid frequency range, this causes a boost in the equalization curve. I often apply this effect to create a fuller soundscape... dates back from the days when I had no synths at all to create tunes with... I had to compensate somehow so yeah, it's a... synthesized synth sound, created by analog mixer channel and genuine cassette tape magnetism characteristics.... if you wish

but now ateast I know what you mean