PCS PRO has been upgraded with more gears, the olders has been updated for low load and better sound. All presets are microphone preamplifiers and NOT line preamps. All presets are in the list above (39 presets). PCS PRO will be as FREE upgrade for PCS owners. Previous customers has 25% discount. However the THD* presets worth the price of the whole library: punch for life ! (the best S*L preamps, period). Without to mention the vintage unit.