Here’s my post from Gearslutz:
A clarification of the Matriarch’s PING PONG Delay:
I consider true Stereo Ping Pong behavior to be:
Send a single, short audio blip into a monaural in of a delay.
Realtime blip is centered (both Left and Right Outs)
First delayed blip is Left Out only (XXXms later)
Next delayed blip is Right Out only (2x XXXms later)
Next delayed blip is Left Out only (3x XXXms later)
Next delayed blip is Right Out only (4x XXXms later)
etc…
Where things got confused (in a very fortuitous way) is that there are actually two independent analog delays. And each one of those two Matriarch delays is capable of creating its own, independent Stereo Ping Pong Delay.
Solution: If you want Stereo Ping Pong, you NEED to NOT feed both INPUT 1 and INPUT 2 with the same audio, or the two simultaneous Ping Pongs will result in something that’s not the Ping Pong you want.
Simply put a dummy cable (other end not used) into either INPUT 1 or INPUT 2 so that only one of the delays is getting the output of the MIXER.
Now you’ll get PING PONG:-)
The really cool part about that is that you now have another, independent analog delay that can also do true stereo Ping Pong.
I explain and demonstrate this in detail at 8:53 of this video:
https://youtu.be/X-XancYyXY0?t=538
{TIP: If you have a Grandmother and a Matriarch, you can use one Ping Pong Delay for GM and one for M!}
https://youtu.be/X-XancYyXY0?t=382