What can I do at home to help my child?
The best you can do as a parent, for your child with autism, is constantly support your child in whatever she/he wants to do in terms of music therapy. Even if your child asks for a specific piece of equipment for some time to practice, you should try and give them the opportunity to practise and further help the therapy being provided by music.
Other Questions
How does Music Therapy help my child with Autism?
When can I start using Music Therapy for my child with Autism?