Thank you for the post, this is really inspiring. I found that for myself and my creative work, spontaneous recordings done with my phone are a great tool for writing down mental notes and sketches that can later be developed and worked out to a full fledged work. :)
I will have to try this now that I know how to use the voice memo app. I resisted it for a long time, but I think I have the space in my head to make notes that way now.