How can I apply ReplayGain after ripping songs?

[Masmic]

I'm trying out dBpoweramp. Since 2006 I have used MediaMonkey to rip and manage my music. I had been ripping to MP3 (192 kbps) for storage reasons, but now I decided to re-rip all my CDs to M4A (ALAC). I had been using MP3Gain as well. I playback my music using MediaMonkey, MyMedia for Alexa and also, I transfer my songs to my iPhone for playback on the go. After close to 200 CDs, I realized that MP3Gain doesn't apply gains to M4A files. Can I select all the songs I've ripped and apply TrackGain to all of them?

[Spoon]

PerfectTUNES - try that one, it has whole replaygain program which makes it super easy.