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Hello, everyone I've been using ES for years and I have a brand new problem since I bought a new iMac 27" Retina 5K running Yosemite 10.10.2. I am a court reporter and I record interviews and depositions in the MP3 format using a two-channel Marantz PMD670 digital recorder. Channel 1 is the live audio track of the participants and Channel 2 contains my voice recorded using a Stenomask microphone on the other channel of the Marantz. When typing transcripts, I transcribe using Channel 1 but often switch to Channel 2 to check anything that's not clear on Channel 1. In my many years of doing this, I've never had any problem with the recordings. Both channels have always been extremely clear and with good volume and ES has played them perfectly. On the new iMac, for which I purchased new licence for Express Scribe, I am using Express Scribe 5.70. Channel 1 is still clear and loud but Channel 2 is almost completely muted. I checked all the input settings on Express Scribe and made sure they were exactly the same as the ones I had used previously on my old iMac. When that didn't improve things, then I readjusted the sound output settings in the iMac System Preferences. The output volume is set at maximum and the balance is set right in the middle. I tried increasing it to the right and increasing the volume for Channel 2 in Express Scribe. When I did that, Channel 2 was a little louder but it's extremely distorted and largely unintelligible. It's completely different than what I used to have. I can't understand why one channel is perfect and the other is useless. I had an older iMac (late 2009, 27") and had recently updated the OS to OS X Yosemite (10.10.2) and was using Express Scribe 5.50, and even after I installed Yosemite, it still worked perfectly. So I conclude that the problem is related to the new iMac Retina 5K, not to the Yosemite OS since both machines have the exact same OS. I've checked every setting that I can think of but nothing has improved the Channel 2 playback. This new iMac has been available for several months, and since NCH has obviously devoted a lot of work to making good software for Macs, I did not expect to have any problems with the new computer. I would have expected that NCH would have made sure that all its apps play well with the new models. I did find a few references to problems with Mavericks on other Mac threads but so far I haven't found anything similar to my problem. This is really frustrating because this is my job, and so far I haven't found any app that could replace ES. I hope an admin is reading this and can help me find a solution. Thank you Patita (Canada)