Greetings Maxman65,
Upon reading your follow up statement, "Yeah I think you can edit the presets," I reviewed my DP008EX manual--new unit, still in box, so not hands-on with it yet. (I've been learning my DP24SD at present.)
As I understand pages 61-68, you can add the same preset effect selections during mix-down or mastering rather than only while recording, which in the latter approach you cannot undo the selections.
I didn't get too in depth in reading (for this reply), but page 65 seems to indicate that if in Mastering mode you can listen first to various effect selections (presets meaning engineered as predetermined in degree of effect, not meaning presetting only before recording as their only use, politely mentioned) then apply what you choose. However, you cannot undo selections once applied in Mastering mode as the manual seems to state.
Of possible interest to you, at the very end of page 65 (under Note), it seems to indicate that using the Mixdown mode (rather than Mastering mode) allows you to undo your effect selections once applied (in Mixdown)--please, be sure on this latter point (by trying it by experimenting) before undertaking a multitrack project, saving you effort if I am incorrect even though it is plainly stated.
You also have Manual mode application of effects (it appears) rather than only preset selections. However, by trying different predetermined settings (presets), it may give you an better idea of how each effect indeed affects what is recorded--from there you may want to try manual applications to see if of benefit once understood of use, or simply stay with presets by using your ear for what is nearest what you want.
Depending on your intentions, if presets works fine for your desired goals there is no reason to get into the more technical aspect of using effects manually though equalizing would be important I would imagine.
Some learning suggestions about your unit:
You may enjoy reading the Tascam forum section on this site.
Suggestively, if you go to YouTube and search Phil Tipping Tascam, you'll find a thorough instructional series on the DP24SD. It should overlap in above applications for adapting to the DP008EX.
Welcome to your Home Recording forum, JeffF.