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Play Speed | play_speed  – A multiplier for the playback speed. Value of 1 means that each timeline frame corresponds exactly to one cache file index. If the play speed is not exactly 1.0, frames will be blended between by using the method specified by the Frm. Grid Blend parameter. If you want to blend particles, you must have exported their ID channel during simulation (this can be done from the PHX Source or Foam/Splash rollouts, depending on the way you create your particles). Note that Play Speed is not keyable - you should switch to Cache Index mode and animate the Direct Cache Index.

Frm. Grid Blend | frmblend  – Used for grids when the Play Speed parameter is not exactly 1.0, or the Direct Cache Index for the current timeline frame is fractional, or you have specified a Loop Overlap in Loop mode. In these cases, a single timeline frame must be constructed from two cache files by blending between them. Each time the timeline is scrolled to a new frame, the caches for this frame will be blended again. You can choose between three different methods for blending between grids from cache files. Note that particles are blended using a much simpler method and Grid Blend does not affect them: