Upgrade suggestions for mic preamp and main output

[tdashmike]

I recently just bought a Tascam DM-24 digital mixer board and plan on doing some upgrades.

Does anyone have any suggestions on upgrading the analog input section and also the main mixer outputs?

A/D converter is AK5383
D/A converter AK4527
Most opamps are BA15532

Thanks!

Here are the schematic files in PDF:
Section[/URL]
ADC Section
Output Section
DAC Section

 

[tdashmike]

Here are the fixed PDF links
Input Section
Input ADC
Output Section
Output DAC