Hi Len
There seems to be a lot of misconceptions generally regarding this type of pedal, certainly the information in the manual regarding a Tech 21 “Liverpool” states that it can be used in front of an amp. Notionally the Joyo is a similar pedal, so one would expect there to be commonality, although I can’t find a specification or manual for it. I think the logic is that this would not normally be the case as most would get a amp suitable for their musical tastes, but at a pinch could be used for tone shaping on the odd number or two, direct to PA or a recording setup would seem to be the norm.
The recommendation for the “Liverpool” is that it goes into the low input socket and controls on the amp are set neutral with possibly the high reduced if it sounds a little too bright. They say it can also go into the effects loop return, which will disable (by pass) the pre-amp of the amplifier.
Here is a link to the instructional manual for Sans Amp Character Series (the “Liverpool” is part of this range)
http://www.tech21nyc.com/support/manual ... 010-OM.pdfThe “Liverpool” type 2 also has a button to defeat speaker simulation, the previous version didn’t. Again, they say that if this is defeated there is a 6dB per octave roll off, which will provide a more natural pre-amp sound when going in front of the amp. With the previous model and probably the Joyo one would possibly need to reduce any brightness on the amp via treble reduction.
Some, including myself, have found that it can also make difference as to where it is placed in the chain for best signal path matching, I personally have found that that the analogy of trying to reconcile it with an actual amp is not necessarily the best in this respect. People have have had success by placing it before and after an echo, in my case I’m using a Catlinbread Echorec (Anologue) and found it took the edge off it, but others get excellent results the other way around.
The Wampler “AC Thirty Something” is another pedal that may be suitable, whilst not a budget range, this as a newer product that has very interesting control over tonal features:
https://www.youtube.com/watch?v=g_woiequaPwHope this helps.
Regards
Gary