Can I use my casio ctk601 as a midi controller.? I'm using ample sound guitar and studio one 5. Does it just hook up through my audio interface?
According to page E-7 of the User's Guide, the CTK-601 has MIDI IN and MIDI OUT ports, so it should be able to act as a MIDI keyboard controller.
As long as your audio interface has MIDI ports, you can connect a MIDI cable from the keyboard's MIDI OUT to the interface's MIDI IN, and-- if you also want to be able to sequence MIDI data from Studio One to the keyboard-- you can connect another MIDI cable from the interface's MIDI OUT to the keyboard's MIDI IN. See the picture on page E-42 of the User's Guide, but replace the MIDI sequencer with a MIDI audio interface.
To use the keyboard as a controller, you'll probably want to turn off its Local Control; see page E-45. To set the keyboard's transmit channel, see page E-44.
You'll need to add one or two external devices for the keyboard in Studio One. I don't have Studio One installed on my new computer, but if I remember correctly you add a "new keyboard" if you want to send MIDI data from the keyboard to Studio One, and you add a "new instrument" if you want to send MIDI data from Studio One to the keyboard. If you want to do both, then you'll need to add the keyboard as both types of external devices.