MOTM

>MOTM thunder w/echoes:
>
>www.synthtech.com/demo/motm_thunder.mp3
>
>Pink Noise from MOTM-101 feeding a MOTM-420 VCF set very low (~40Hz), which
>generated the control voltage into the FM input of a MOTM-440 LP 
>VCF. White and
>Pink noise enveloped from an Encore UEG is mixed and fed to the MOTM-440.
>

I did a thunder/explosion sound on one of my self running patches. To 
get the initial crack to stand out, I found it helpful to run it 
through a highpass filter (420) and then cross fade that into the 
lowpass filtered rumble. There's a snippet of it here:

http://www.synthtech.com/demo/101_hullbreach.mp3