Thanks for your tips and feedback!
To start of this journey I wouldn't really mind to use it as static effects. I was planning to take for instance a chord from the REV2 going into my mixer then take a send and return channel to send it to the 914 and take the output back to a mono or stereo input on the mixer. All the send / aux channels on the mixer are mono anyway. But there will be a problem with the audio levels that way?
On the Springray i think i dont need much modulation I will use it more like an amplifier. As for the Shapeshifter and Lyra8 I do see the need for modulation. Would the MS20 be an option?