Mac/dp6.01/soft Syth Recording, Audio Monitoring shows spiking Options

[bmcbean49]

Hope I can explain this correctly. I have a Mac Pro ver. 10.5.8 w/ 2x2.66 Ghz Dual-Core Intel Xeon.Memory is 1 GB 667 MHZ DDRS FB-DIMM, DP 6.01, Interface is MOTU micro lite, I am using MOTU soft syth Ethno & Symphonic and Kontakt.
Ok here we go: I recorded a song using 12 tracks, on playback it worked fine, but a week later when playing back the song I could see in the Audio Performance that it was spiking. Now I do have reverb on the Ethno & Symphonic. I do know if you put too much the CPU goes up. I took them off but it still spikes.
If I have explained this correctly, can anyone give me some insight on the problem and solutions.

Thanks