Thats the beauty of the Pinsound board... you can use whatever sound clips you want for any event. You can put the original callouts back in and keep all the awesome soundtrack work that Endprodukt put into that mix.
Its just that compared to the high fidelity stereo soundtrack, the original mono, low bitrate callouts will sound like they are coming out of a tin can...
The Pinsound board appears to be crazy expensive but the fidelity and audio tuning options are awesome. You really don't need a speaker upgrade or sub-woofer (although, one still would help with the bass extension). You have total control of the backbox volume, bass and treble and the cabinet speaker volume, bass and treble. Made the stock speakers in my DE SW sound like a high end audio equipment... well... almost.... I do not feel the need to upgrade the speakers at least...
So for those of you willing to spend $150 or more on upgraded speakers, you may want to give the $340 Pinsound board a try first... You will get the benifit of better amps and more tuning options plus, you can (if you want) easily change out parts of the game's soundtrack.