how do I 1, void w/o re-issue and 2, void with reissue?

Adagio uses the word "void" to mean the check never printed properly. You want to use the word "reverse".

You reverse a check under Check Reconciliation and then post the reconciliation. The default is to re-establish the invoice(s) as payable, for the check to be re-issued. If you don't want to re-issue the check, then you will need to enter credit note(s).

There are some special circumstances when you can credit the invoice at the same time you reverse the check, but for a beginner like you, just stick to the default settings.

I have to do this even though I do not use the check rec in adagio?

Yes.

Is there something bad about that?

no. every system is different
just trying to figure it out.
how do I get to " Check Reconciliation and then post the reconciliation"
?

Make sure that the "Allow Check Reconciliation" box is checked under Edit | Company Profile.

Then use Payments | Check Reconciliation.

Although I don't mind answering trivial questions (actually it's sort of a break in my otherwise hectic day), I think in the long run you would be better off reading the manual, and saving the forum for when you are REALLY stuck.

If you are not a reader, then ask your Adagio consultant to come in and do some basic training.

Steve