Hello. I installed T4 on an HP Elitebook 8570w and an 8770w machine. Both machines are equipped with an i7 3740qm processor, and the 8570 works with 16GB ram and the 8770 with 32GB ram. The following is the error: when T4 starts and I use all 4 players, - "but if I use only the four, it doesn't work either" - no sound comes out on the four channel - no noise, no sound - nothing. The sound card works perfectly with the T3, the output and input of all four channels also work perfectly. The T4 4 player starts the music, but there is no sound. There is no sound when e.g. I try with F1.. Channel 4 is completely "blind" ..... neither its output nor its input works for the sound card. Please help me.