I have my HD 500 going into my IPAD. There are a number of ways to do it. You need a guitar to computer interface. I tried 4 different ways; this is the one I chose.
(1) I plug my HD 500 (1/4in output cable) into a UM2 (Behringer) interface (it's inexpensive; but works for me). You can choose more expensive ones as well.
(2) I plug the UM2 (USB cable) into a TENDAK "powered" USB3.0 HUB. (This provided the power needed for the UM2).
(3) I plug the USB HUB into an Apple "lightning cable" camera adapter (with USB and power ports).
(4) Plug the camera adapter into your IPAD lightning port. I plug a power cable into the camera adapter port so the IPAD will always stay powered up.
Your IPAD will select the UM2 input (not the IPAD microphone) and you can use your IPAD headphone jack as your monitor.
You can record in GarageBand or any other DAW (Studio One, Zentracker, etc) and use various plugins (Tonebridge), mobile POD, Rhino, etc).
I hope that helps. Bill