OSS News Preorder a MOSTRO! Pre-orders for MOSTRO are open until August 31st. During this period, there is a discounted price of US $425. The regular price is US $475. MOSTRO at the Semana de la Escucha OSS was at the Semana de la Escucha (Listening Week). An event focused on sound creation and the process of listening. We played a called Futuros Posibles (The Possible Futures) where we feature our generative systems and obviously a couple of MOSTRO synthesizers. Outer Space Sounds in Hola Wave, Mexico City We went to Hola Wave, a synthesizers store in Mexico City to present our MOSTRO. Click for videos. Welcome! We are presenting our website. All of our content is in English and Spanish. Please do not hesitate to send us questions or ideas about Outer Space Sounds and MOSTRO.