Just as a little sidenote here is a question I asked various people and the answer I got from a technician from Meris Pedals:
So what is the best option in order to recreate what Frank Zappa did on his Shut up and play yer Guitar Album? Bonus Question: How exactly did it Frank Zappa when he recorded Shut up…? (What you find about it in terms of Zappa Quotes, the nice but not very concrete Zappa Gear Book etc. is only fragmentary information.)

The basic signal chain that Frank used according to Dweezil should be like this:

Guitar goes into Wah Pedal then the signal goes into:
-> Amp 1 -> Out 1
– >Amp 2 -> Out 2
-> DI Signal -> Out 1 and/or Out 2?

Now we have a couple of options:
1.1: Dynaflanger on one Stereo Channel
-> Amp 1 -> Dynaflanger -> Out 1
– >Amp 2 -> Out 2
1.2: Dynaflanger on two Stereo Channels
-> Amp 1 -> Dynaflanger -> Out 1
– >Amp 2 -> Dynaflanger -> Out 2

2.1: Dynaflanger on One Stereo Channel + Phaser
-> Amp 1 -> Dynaflanger -> Out 1
– >Amp 2 -> Phaser -> Out 2

2.2: Dynaflanger on two Stereo Channels + Phaser
-> Amp 1 -> Dynaflanger -> Out 1
– >Amp 2 -> Phaser -> Dynaflanger -> Out 2

3.1: Dynaflanger on One Stereo Channel + Phaser + Wah
3.1.1
Wah-> Amp 1 -> Dynaflanger -> Out 1
Wah- >Amp 2 -> Phaser -> Out 2

3.1.2
Wah-> Amp 1 -> Dynaflanger -> Out 1
Amp 2 -> Phaser -> Out 2

3.1.2
Amp 1 -> Dynaflanger -> Out 1
Wah->Amp 2 -> Phaser -> Out 2

3.2: Dynaflanger on two Stereo Channels + Phaser + Wah
3.2.1
Wah-> Amp 1 -> Dynaflanger -> Out 1
Wah – >Amp 2 -> Phaser -> Dynaflanger -> Out 2

3.2.2
Wah-> Amp 1 -> Dynaflanger -> Out 1
Amp 2 -> Phaser -> Dynaflanger -> Out 2

3.3.3
Amp 1 -> Dynaflanger -> Out 1
Wah – >Amp 2 -> Phaser -> Dynaflanger -> Out 2

So these are the routing options I see. Apart from that it remains unclear for me what happens with the DI Signal? Should it go into Out 1 or Out 2 or in both Channels of a Stereo Setup? I only know that Dweezil stresses the point that it was important for his father to add a DI Signal for more pick attack clarity.

ANSWER FROM MERIS:

I would start with any of those setups in the 2.1 or 3.1 channel. It sounds like certain effects are being turned off and on throughout the record (Shut up n play yer guitar) (including wah and phaser). For the DI track, you may consider recording that in the center. This way you have the stereo amp setup with per-side effects, and the center with a little DI signal mixed in for clarity. Of course this is all suggestion, I recommend exploring and trying out different pedal arrangements for whatever gets you closest to that sound.