1960's Innovex RSM Effect w/ Stand - A weird one for sure! Originally aimed horn players as a means of giving them a sound pallet that is normally reserved for guitarist and keyboard players. By micing up the horn they could process the signal and amplify or record it directly. Of course guitarist and keyboard players also adopted these devices. There is a bit of a signal difference between guitar level and that of a trumpet, so running into a DI or preamp might be required to get the best results.
This particular unit is noisy and may require some work. Sold as-is.