Not sure if LP's have stridulation organs, but I the genus "Psalmopoeus" means translated "Psalmsinger" and they actually are able to stridulate, though I've never heard any doing that either...Yes, I understand it is stridulate, but mine did exactly that and I didn't know that this species had that characteristic.
Uhm, don't! Prodding a T continuously is stress for the animal and doesn't help. If you got it from Swifts, I'm pretty sure it IS an LP. Leaves the question about the stridulation...no idea since I don't own one of those. Others might be able to shed some light onto this...I am a bit ignorant on how to post a pic, but it was purchased from Swift inverts as an LP. I will tease it a little again with a paint brush (in time) and see if it is a recurring thing.