I was surprised that the 9000 pro and the PLG expansion board have more bottom end depth to them than the Tyros, given the pro should be the same sound. I ensured that when recording the Tyros the output eq was flat and compressor was off. I have asked "the pro" to check this on the 9000 pro and if possible to resample them without his mixing desk in line (even though it was set to flat and no post fx). In my case I connected the tyros outputs direct to the pc soundcard without using the mixer. We both used the same soundcard, same sampling rates and same mp3 bit rates so there shouldnt be much other difference.
Out of interest I felt the pro sounded best, the PLG board second and the Tyros third. The differences were marginal though and it was only the enhanced bass of the first two through my YST-MS50 speakers that tipped the scales for me.
Regards
Simon
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Simon G.K. Williams
simon@svpworld.com
Creative Music & Multimedia
http://www.svpworld.com________________________