The PS553 switcher is a modular card-based system that supports a variety of analog and digital source devices and provides one output that is HDMI and a buffered duplicate VGA output. The system also features a microphone input that is internally mixed over the selected source device for aural sound reinforcement for the presenter. This card-based system provides exceptional "value-engineering" design flexibility by only requiring the boards necessary for a given solution while "future-proofing" installations for field expansion and modification at a later date. This design concept benefits the end user as well as the systems integrator. End users need only purchase what they currently need while safeguarding unforseen future changes or expansion. For systems integrators and dealerships, this design annuitizes an installation beyond the initial installation with long term expansion opportunities. The PS553 is a fully digital switcher offering backward support for analog source devices. Analog signals are converted to digital signals. Signals of lower resolutions, such as Composite, S-Video, or VGA at lower resolutions are scaled as necessary to match projector resolutions for crisp and clean images. This design allows customers and systems integrators to use today's higher resolution dislay devices while supporting a wide variety of sources.