Doepfer

I just searched the list and found no posts regarding this modification. I purchased this module when it first came out and I thought it was great, except that the attack time was a wee bit too slow. I was surprised when I found on the Doepfer site a page which shows a way to mod the Attack/Decay time by changing one capacitor value. Here's the page:
http://www.doepfer.de/DIY/a100_capacitors.htm

It says that the timing capacitor (C1) is a 2.2 microfarad, corresponds to about 5ms shortest attack/decay time. Does "shortest attack/decay time" mean that it can't get any quicker? What if I lower the value of the cap? I wanted to ask if anyone has done this and what value did they use. I'm really hoping that it's possible to make the attack a bit more snappy (like 1ms) because the module is great but the attack time is too slow for my personal use. I'd love to hear any responses regarding this.

Regards,
John