All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
A group of scholars issued a Fatwa stating that the ruling concerning the Mushaf (the Arabic copy of the Quran) does not apply to a cassette or any object used to record the Quran in regard to the prohibition of touching them without ablution.
Allah knows best.