I only just saw this post....
BillT wrote:Having trouble getting this to work! I've added it to the Paks folder, but it doesn't play the drum samples, even if I select it from 'new' menu and 'random' new mix.
In 'new' menu, Morphing Drum + Bass appears with tick next to it, but is greyed out. How can I get it going?
I am not sure what version you are using (iOS/macOS and Wotja Free/Wotja 2017/18).... From what you describe my assumption is you are using Wotja (Free) in Free Mode and you are just encountering the limitations in that mode.
In Wotja (Free) in Free Mode (i.e. without an active subscription) you have accesss to use 3 Template Paks and their content. In the Templates screen other paks, such as the MDB pak, will show on the left as greyed and you will see a "Store" button at the top of the rhs content list. You can still preview the the templates from a greyed pak, even if you cannot add them to a mix. Try tapping on e.g. Filt_Kit_A and it should play.
NB: In Free Mode greyed paks cannot be selected for randomisation, either (Settings > Random > Templates for Randomisation).
Tip: In the Template list try also turning on the toggle "Show Older?" and then preview some of the generative drums in the IM2 Gen Drums paks.
So, if you wish to use those templates in a mix, all you need to do is get a relevant subscription tier or get the annual version!
Hope I have understood correctly and that helps,