[spurgu]

I suppose it depends on the house, and floor, but I think it might be fine as you're not explicitly saying "call". I always just say "raise" and put in the chips (all at once!), or say "I raise to XXX" with XXX being the total amount (call+raise), after which I can take my time counting out the chips (or put more than the total raise amount if I don't have exact change).

Saying call and then adding a raise is similar to string betting, where you first put some chips to gauge your opponents reaction, and then put in some more. That's not allowed but so many beginners do it.