Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Using with a Samsung Galaxy S4. I can't figure out how to get it to replace the phone's built in mic when recording video. Please help!
Document: Like I said, I am using the iRig Pre to record video with superb audio quality, which is leaps and bounds over using the iRig Mic for those of you who wish to use your favorite studio microphone for studio quality sounding demos.It's amazing how far technology has come, and IK seems to be at the forefront. So, for killer vocal tracks using your own microphone, check out the iRig Pre...It also comes with two free recording apps to get you started!
I have been an audio professional for 27 years and I have to say this thing is brilliant. All of the negative reviews here have one of two things in common: they were not using the iRig for its intended purpose or they did not know how to use and care for it.It's a simple device to use and works well with iPhone or my Samsung Galaxy S4.
Not the end of the world, but slightly annoying.Even with those two issues, I don't feel it justifies dropping a star. The ability to use an XLR mic on my iPhone to replace the audio while recording video is simply outstanding. I've experienced very clean sound (no hiss that others are reporting), and because of that, I'm thrilled with the result.
I mainly use this for interviews and such in public settings to get a mic closer to the mouth of the person speaking. In other words, I'm not doing studio recordings with this pre. It's very easy to carry around with a decent handheld or lav mic. I sometimes use it plugged into my iPhone or iPad using the Camera app or Filmic Pro for a simple setup. But most of the time I'm using a DSLR to shoot video and my iPhone with either the VoiceRecord app or the iRig iPhone app.
So much noise. I can't get a decent recording fom this device. Tried pulling the gain down and applied noise gate, the noise is still audible.
I read most of the reviews, getting an overall positive opinion that this worked pretty well, and decided to give this a shot. I tried this with an AKG Perception 120 condenser mic, and two apps: The IK Multimedia app, and &#34;Recforge Lite&#34; on my Samsung galaxy s2 and android 4.3.
I'll next be testing the PRE using AKG C3000 mics with the iRIG PRE's Phantom power source. Can't think of a reason that I couldn't use the preamp to process other normally HiZ inputs such as guitar. It'd be a matter of using a DI or maybe the XLR outputs of guitar or bass processors, brought into the iRIG's XLR port.The next adventure will be to use the USB interface on the Samsung to attempt stereo inputs to the iRIG app. That's for another day and another month's budget...
I wanted to try this product for a very specific application. I do social media videos for work every other week, and was looking to streamline the process a bit. Because the videos are being primarily being played on facebook, I don't need to use the really nice cameras at work. The issue, however, is that the audio quality on the lower end devices leaves much to be desired. So, I figured I'd try using the iRig PRE to replace audio on an iPhone 5 recorded video.
After increasing the gain almost +20db, the signal increased to a still less than acceptable level, and the noise floor increased to a massive enough degree it would render any recording very very poor. For an A/B comparison, I used just the built in microphone on my smartphone and recorded the same distance and level of voice, and my smartphone mic sounded loads better with way less noise.
I am using this unit on both Apple and Samsung products (they have the same input plug) with good results. I generally use a hand-held Sennheiser mic, but I can also use studio mics requiring phantom power. The unit looks more professional than the Logitech version I also own, and it uses a 9 V battery, as opposed to 2 AAA cells. I believe the gain is a bit better on this unit, but a lot depends on what software you use, etc.
Answer: I do believe that the I rig is made for Apple products. However you need to go into your settings and set your microphone for external instead of internal that would be the only thing I can think of other than that I would not know. Sorry