The unrelated Maxon Corporation is a major global supplier of industrial heating equipment .
Maxon (Nisshin Onpa) started out in the mid 1960s as a guitar pickup manufacturer.
Both the tapped and untapped signals are sent through their own sets of filtering op amps (3 apiece) which help get rid of clock noise and hiss.
Then the signal is sent through another THAT4315s Compander chip and into a mixing Op Amp (where the clean signal is mixed with the delay) and out.
Both outputs feature Mechanical True Bypass via a 4PDT switch.
The AD-9 Pro starts with a string of low gain, low voltage op amps designed to boost the signal and shape the sound without adding distortion.
When Panasonic closed down their BBD production line in the mid 2000’s, Maxon had a tall task ahead of them to redesign their legendary AD-9 Analog Delay around a different IC chip.
This switch activates a midstream delay feedback loop, creating polyrhythmic repeats against the main delay repeat.
The driver is running the BBDs at a very low clock rate to achieve maximum delay time.
This rolls off a fair amount of high frequencies, giving the AD-9 a big, warm delay sound.
The result is a rounder, smoother delay repeat that doesn’t overpower the original note.
With a wider dynamic range and max input level of 12 d B, the AD-9 Pro can accept signal from any source.