Hi, can you please clarify what sounds you are seeking? The H90 is quite capable of a wide variety of sounds, and I would be surprised if the sounds you’re looking for are not already in the H90.
For starters, based on your last sentence I would encourage you to try out Blackhole with Size set pretty short (in the 0-20 range), Feedback set to 0, and the rest of the parameters to taste. In particular, experiment with Gravity – there’s a large range of sounds in that particular control. Think of the modulation rate and depth as a tonal control, especially at smaller Size values the Depth knob can be used to dial in the top end separately from the EQ Low/High/Contour controls (I recommend you set the EQ flat to start with, and dial it in last once you have the core Blackhole sound you want… and I recommend cranking Resonance to value of between 20-50 once you have the core Blackhole algorithm set up how you like). Blackhole is equally powerful at adding subtler smears and diffusion.
MultiTap and UltraTap also have smear and slurm – respectively – that are useful for adding subtle air. Additionally, MicroPitch and H910/H949 in Micro mode can be used for subtle decorrelations, even with modulation turned off – we are seeing wide use of MicroPitch Immersive for a mild smearing effect, and I find this translates into the stereo algorithm when dialed in to taste.