Hi Daniel,
Using pedals with an amp that has built-in effects doesn't alter either of the effects. The amp itself has a ton of effects built right into it, but usually a dedicated effects pedal will sound a bit richer.
For more info on how pedals work, check out this tutorial: https://www.guitartricks.com/tutorial.php?input=1621
If you have any questions, comments, or concerns, please contact us.