@d6 @voxel alternating samples like this is like halving the sample rate of each signal without filtering. This will cause all the high frequencies to alias.

The correct way to go this route is to interleave the two signals to get a new signal at twice the rate, then down sample using a low pass filter to get the original sample rate.

However, this will cause some phase distortion in the second signal as it was shifted slightly in time.