Cmnaround wrote:A very timely discussion. I am in similar situation using a mesa rack pre amp. Wanted to know what the difference would be running my pedals in my effects loop of the pre amp vs using an OBEL - which I do not have - but always considered based on all the positive feedback on this board. Would there be a big difference?
Also, any advice on running specific pedals all in the effects loop, or some in the chain from guitar to my amp while others may work best only in the effects loop assuming there is some signal boosting in my effects loop of my pre amp. Other consideration is the wet dry mix I can do relative to the pre amp effects loop - I usually keep at 50% - any advice on how this actually works to impact my overall tone?
There is information about this all over the web. Google can work wonders sometimes. Now if you're talking in relation to jerry garcia's guitar tone. He did not run any effects between his preamp and power amp. Yes there is a difference between running effects before your volume control on the guitar then into the preamp, versus after the preamp into the power amp. You have a parallel effects loop if you have an fx loop mix knob. This is cool because you can blend pedals with your pure dry signal. like a boss digital delay- instead of having your whole signal converted to digital and reconverted to analog you could put this pedal in your effects loop with the mix knob on the pedal all the way up. then you could use your effects loop to mix in delay- thus preserving your pure analog dry signal.
as to the difference in tone- most people that use fx loops put time based modulation effects after the preamp because they benefit from not being subjected to all that preamp gain that can muddy them up- if you distort the preamp on your amp this matters. if you run a clean preamp i dont feel it matters nearly as much, but you can hear a slight difference.
I'm sure you can refer to your owners manual or your amps forum topic or anywhere else on the web to find out what an amp effects loop does and why. Information on the JG buffer is all over this forum if you use the search function. using effects in the onboard fx loop of a guitar allows you to constantly send the same signal level to the effects regardless of guitar or amp volume- pedals behave differently based on how much volume they receive, especially volume based effects like envelope filters. I am repeating this from what i've read on this forum. now how they sound different between an amp and this jgb fx loop is not really easy to describe- more predictable definitely... better? maybe... it's not like describing the sound of an overdrive pedal, it's a feel and practical thing. an envelope filter wont behave the same if you lower your guitars volume. you cant parallel mix with the typical JG fx loop. Parallel mixing is a whole nother topic, but i described the gist of it above. mixing your dry signal with an effects wet signal. pretty much mostly used for delays and other modulations- but they usually have mix knobs on them. your amps fx loop allows you to preserve the integrity of your signal