Hey Shredded, when I started out I was recording my audio separately via my phone.
I have a Samsung Galaxy S8+, I used the AKG headphoens that came with the phone, though I wanted it to be my dedicated mic so clipped off the earbuds so that it was a single wire running to my helmet.
Now whenever I record external audio I still use that same headphone mic but I record into an old iPod touch, there's a recording app that I found that allows you to adjust the gain and pitch so things like wind don't overload the audio file.
One thing I can tell you is make sure that you do a proper wrap on that external mic, use mic foam, then deadcat, and if you're like me add an extra layer to clean it all up, I used a bandana or microfiber cloth on mine.
I prefer to record with a secondary device and sync audio as its not a big deal if you just clap at the beginning, thats the whole idea behind a clap board. Many editing programs can sync for you such as in Adobe Premiere. So I use an app called Voice Record and the Audio-Technica ATR-3350IS Omnidirectional Condenser Lavalier Mic with Smartphone Adapter to record audio. I don't have a deadcat on mine, I use two foam covers over each other. I then attached the mic portion ot he cheekpad in my helmet right next to my mouth with velco.
I think I get pretty good, clear audio for my vlogs with this setup and the powered mic is a bit more upkeep, but worth it in my mind. And the Voice Record app allows for control of the gain, as well as other level, to get the best audio you can with your helmet and bike noise.
On my channle I have a video called My Vlogging Rig that shows my setup if you want to take a look. I also explain the iPhone handsfree headphone/mic setup if you have a pair that you don't mind removing the headphones from to record audio.
I have a tascam, a zoom and a sony digital recorder and I still prefer the app on my phone. Not having to carry an extra device, we all carry our phones everywhere, is awesome. And the app I use has every one of the functions of my other audio recorders plus the benefit of being a small computer. Phones these days out class handheld audio recorders in processing power and storage. If you're looking to do multiple channels such as get the bike and your voice seperatly, that is a different story. That is where a tascam or zoom show their worth. You can plug two mics into them (or even more depending on how many channels the device supports) I however have a loud ass bike and there is no way to completely remove that from my voice track, no matter what I do, so I find it best to just minimize the bike through Gain and mic placement and stick with the app on my phone with a single mic.
I refuse to use the big GoPro mic adapter and currently record my audio separately on to my iPhone using the app “Voice Record7” and a headset that I got rid of the earbuds and then wrapped the mic with foam and cloth.
I’ve got the mic mounted inside the helmet with about 10cm cable running out of the helmet, enough to connect my extension cable for the days I vlog, and short enough to easy hide inside the helmet when just riding.
The sync is a piece of cake in Final Cut Pro and I add some brightness to get rid of the “muffled” sound.
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