For a while now, I’ve been using an iRig with my EWI. It works rather well considering the price. It allows me to hook up my EWI to an iPad/iPhone/iPod and use programs like Garageband to add effects. You can also even get Looping apps so you can layer sonic creations on you iOS device.
My one complaint about the iRig would be that it is rather noisy. You can hear a lot of audio noise while using the interface as it plugs into the headphone/microphone jack on your iOS device. Latency isn’t a factor at all, which is really the bigger thing I was concerned about. Nothing sucks more than have a delay between when you physical sound a note (i.e. blow into the EWI) and hear it. My EWI settings are all tweaked to make it near instant (so no effect usually on the patches). For $30 (actually, look around iRigs are cheaper than that now) the iRig strikes a good compromise between features and audio quality.
The iRig HD fixes two issues in the original iRig. First, it fixes the audio quality problems by now plugging into either the 30 pin connector, the lightning connector, or via USB. So the signal is, I think, all digital now. Second, you now have a gain dial right on the device, so you can dial in the right amount of gain (and help eliminate noise). It’s about 3 times more expensive compared to the iRig, but it does come with the ability to unlock some amp sounds in Amplitube.
Which to get? Honestly, the original iRig works fine on EWI. The noise level is totally acceptable (sorta sounds like audio tape hiss…..so sorta retro sounding). If you plan on using the iRig with a REAL guitar as well as an EWI, you might want to get the iRig HD instead. It is sooooo much better than the original iRig in terms of noise when you use an electric guitar.
Check it out.