The recording source is a 24bit 48kHz recording from PRESONUS Capture. Sometimes a AUDACITY recording track from other band members on other computers. Once imported the tracks sounds perfect. I also can open the Multitrack-OGG several times - nothing changes.
Such tracks on position 1 to n-1 are never affected. You can export and import them as often as you want. Only sometimes the last track sounds like being lowpass-filtered, sometimes it sounds only quieter (see attachment) . It looks like it always happens with our (recorded) “metronom” track. It happens during exporting. I know this, because I can open such a corrupted file on different machines and the bad result of the last track is the same.
It does not happen always. I did not find out, why and when it happens. But when I do this steps, I have a high probalilty to get the behavoir:
Import a OGG-file (quality=10) with more than 5 tracks
Import a new track. The track is at the bottom
Mark some music in the new track
Create “silence” (CNTR+L) in the selection
Move the track to a higher position on screen
Move the METRONOM track to the bottom
Export all as Multitrack OGG-file (quality=10)
Open this file again. The last track has changed.
The attachment show two tracks: The original track and the same track after Export.
Do you mean “multi-channel” OGG files, rather than “multi-track”?
Do you mean that in step 1, you are importing one OGG file that has more than 5 audio channels? If so, where did that file come from? Is is a “5.1 surround sound” file? Where did you get that file?
sorry for my english. Of course we are talking about “multi-channel”. And the channels belong to a big-band recording project. Each mono channel is recorded by a musician and contains his instrument. In total we will have 16 channels per song. At the end we will master it to a normal STEREO-MP3.
Each recording project starts with 5 basic MONO channels: DRUMS, METRONOM, PIANO, GUITAR, BASS made on a PRESONUS digital mixer, recorded with PRESONUS CAPTURE on an MAC. For transporting purposes we transform this into a multichannel-OGG-file: Import the channels into a new track on Windows AUDACITY, export it as OGG-File, send it to our server ,where the other musicians can download it. They record (add) their instrument in another channel on (Windows) AUDACITY and send back a track, which contains only the new single MONO-channel. Day by day we import the returning channels (in AUDACITY) to the main project and export again the complete OGG-file and update it on the server. At the end we will have 16 mono-channels and we will start the mastering.
So it has nothing to do with 5.1 or surround sound.