I understood that the resultant file had two identical channels in it. I was asking when this occurred. If it is in fact happening during recording/monitoring, wherein the levels and waveforms of each channel are exactly identical, this really sounds like a settings or driver issue.
On that note, I don't know why you're so sure that your capture devices are in fact capturing both channels, and are not dropping or duplicating one of those channels prior to hand-off to Audacity. Have you tried monitoring those inputs via your operating system or using different capture software? Because you haven't mentioned doing so as yet.
One possibility that I could imagine causing something like this is if each channel of the input devices shows up as a different virtual input in Audacity, labeled in a somewhat opaque way, such that you were in effect manually chosing a virtual input devices that was dropping one channel. But this is not likely to be the case with the particular capture devices you've mentioned. It is difficult to help diagnose the issue and suggest possible solutions - other than using different software or really tracking down this purported bug and manually patching Audacity itself - without more information about Audacity settings, operating system you're using, OS settings, driver version, etc. Screenshots might be the best way of going about that.
-------- Original Message --------
From: CJB <[log in to unmask]>
Sent: Wednesday, March 21, 2018 09:39 AM
To: [log in to unmask]
Subject: Re: [ARSCLIST] Major Snafu with Audacity
> Its not the export process, it occurs at the capture stage. The
> Behringer / iMic whatever outputs digital stereo OK. Its Audacity that
> loses the input right channel and replaces this with the left channel.
> The input left channel remains OK. So the resultant capture is a
> 'stereo' file but with both the right and left channels identical to
> the input left channel. This effectively then sounds like a mono
> recording. CJB
> On 21/03/2018, Eli Bildirici
> <[log in to unmask]> wrote:
> > What I think you're saying is that after file export to WAV or FLAC, the
> > resultant file is a stereo file that has the left channel in it twice,
> > right? Not that during the act of recording, the left channel isn't ever
> > coming through at all. If the latter...that sounds like an driver issue,
> > device setting issue, or other issue with the capture devices themselves,
> > tbh. You can troubleshoot this by monitoring from Audacity while recording
> > rather than your sources. And I don't know what could cause the former, as a
> > matter of settings; if you're exporting the entire file than that's what
> > should happen - you should have to manually duplicate the left channel and
> > delete the right otherwise.
> > This sounds very odd. I can't say I've ever experienced anything like this.
> > I've reimported files into Audacity after having recorded them and they've
> > looked and sounded just as they did pre-export, none of these
> > channel-dropping shenanigans. I should like to know how you first noticed
> > this and came to this conclusion, and see if I could replicate it.
> > Other than that - if this is indeed a long-standing issue with Audacity,
> > which would frankly be almost criminal, I'd encourage you and everybody else
> > to stop using it for this purpose. But this is such a severe,
> > basic-functionality flaw that I have to remain skeptical that that's what's
> > happening here.
> > -------- Original Message --------
> > From: CJB <[log in to unmask]>
> > Sent: Wednesday, March 21, 2018 02:07 AM
> > To: [log in to unmask]
> > Subject: [ARSCLIST] Major Snafu with Audacity
> >> Help!!! I'm using Audacity (the latest) to digitise masses of
> >> cassettes and reel-reel tapes and vinyl records. BUT it has a major
> >> flaw. Even though I'm using a Lenco stereo transcription deck and a
> >> dual stereo cassette and a stereo reel-reel deck - the end result is
> >> always in mono.
> >> The stereo recordings are digitised as confirmed by monitoring the
> >> input to the digitisation device. However the output is recorded by
> >> Audacity as in mono.
> >> The chain is this:
> >> Lenco Transcription deck > analogue stereo output
> >> Akai 4000Ds Mk Ii Reel To Reel > analogue stereo output
> >> Double Cassette Player > analogue stereo output
> >> Behringer UFO202 UPhono USB Audio Interface > analogue stereo input #
> >> digital stereo output
> >> Griffin GC16035 iMic USB Audio Adapter > analogue stereo input #
> >> digital stereo output
> >> USB (2.0 or 3.0) port on Dell Inspiron laptop > digital stereo input
> >> Audacity > digital MONO output (the right channel is lost, the left
> >> channel is recorded on both right and left channels of the resultant
> >> file)
> >> The various Audacity forums report that this has been an issue for a
> >> long time. No-one seems to have an answer or work around.
> >> Has anyone here got any suggestions please.
> >> Thank you - Chris B.