@pgroslou you can add a second AUDIO WAVE FORM like the one Dave gave you and add it on top of the one in the code I gave you , just disable the opaque settings and alpha the background so you can see both screens, and select the convolution reverb on the processor settings, now you can give the user both options, your convolutions ir or the option of user ir

So I decided to revisit my problem. I first created a very simple arpeggiator and it worked fine without using the Step Sequencer mode on the Notes Number slider pack. So I decided to revisit the same synth arp that didn't work and removed the Step Sequencer mode on the NN SP and it worked. The notes come out as expected, eg. C is a C and not a C#. I am not sure why it didn't the first time, but I am happy now.

@pgroslou Thanks David. I was able to find an example using LAF in the HISE documentation that works well and solves my problem. Much better than using Paint Routines. 👍