Michael Sweet

Michael Sweet is the guitarist and singer who founded the heavy metal Christian band Stryper, after forming his first band, Roxx Regime. Across a career spanning more than 30 years he has also played and sung with Boston, and recorded with George Lynch of Dokken in the Sweet & Lynch project. Along the way he has filled stadiums, sold more than 10 million albums and earned Grammy nominations¹.

For gear, Sweet is a long-time endorser of ISP Technologies, the Michigan maker best known for its Decimator noise reduction. His relationship with the company produced two signature products: the limited edition Michael Sweet Theta Pro DSP, a floor controlled guitar processing system introduced in February 2017 with his personal presets and tone¹, and the Empyrean Preamp Pedal, unveiled in May 2024 through a collaboration between Sweet and ISP².

The ISP Theta Pro DSP signature preamp

The Michael Sweet Theta Pro DSP is a floor controlled guitar processing system built around two preamps: a fully programmable THETA preamplifier and a Vintage preamplifier, both with extensive pre- and post-equalization³. Around those preamps sits a library of studio quality 32 bit floating point digital effects, including wah, compressor, a multistage stereo phaser, stereo flanger, tremolo, four voice chorus, pitch shifter, stereo rotary speaker, a 1300 millisecond delay, ping-pong delay and a studio reverb, plus a full featured tuner with 1/2 cent accuracy³. The system also includes Intelligent Speaker Simulation and ISP's patented Digital Decimator for real-time guitar noise reduction³.

The standard ISP Theta Pro DSP carries the same core architecture: a fully programmable digital Theta preamp, a Vintage preamp, studio-grade effects processing and a built-in full-function precision tuner⁵⁶. What distinguishes Sweet's version is the signature content. ISP introduced it in February 2017 as a limited edition model, and Sweet describes it in his own words:

Sweet says the system allowed him to create the perfect Stryper tone all in one box, and his signature version ships with his personal presets and tone³. For a player weighing a full processing system against a conventional pedalboard, the Theta Pro DSP's spec sheet shows where it sits:

The preset structure is worth a look for gigging players: 224 presets organized into 124 songs, with 3 preset patches per song, so a set list can be laid out song by song rather than as one long bank⁵. The dual XLR direct outputs alongside the 1/4 inch stage outputs mean the system can feed a front-of-house console and a stage amplifier at the same time⁵.

The Theta DSP MSX and the Empyrean

Alongside the Theta Pro DSP, ISP's Artist Spotlight pages associate Sweet with the THETA DSP MSX, a distortion pedal⁴⁷. Where the Theta Pro DSP is a multi-FX floor system with two preamps and a full effects library, the Theta DSP MSX is a straight distortion pedal, the kind of unit that sits on a pedalboard rather than replacing one⁴⁵.

The Empyrean Preamp Pedal is the other half of Sweet's signature line. ISP describes it as bringing "Michael's new tone machine with dual preamplifiers with Distortion providing subtle crunch to over-the-top gain and a killer tone Clean channel"⁶. The company positioned it as a return to an earlier era of guitar sound, saying the pedal "is designed to revolutionize your sound and transport you back to the iconic tones of the 80s"². For Sweet, whose career with Stryper began in that decade, the reference is a natural fit.

The three products cover different jobs:

Where his tone came from

Sweet's own account of his sound starts young. Asked about his tone quest, he says:

From there his Stryper tone was built on a preamp-and-power-amp pairing: he preamped with a Lab Series L11 head running into a Marshall¹. That chain, a solid-state preamp feeding a Marshall, is the setup he names for the MS/Stryper sound before his move to ISP's processing systems¹.

The through-line of his gear story is consolidation. The player who started with a Silvertone amp and a Little Muff now carries a signature system that, in his telling, holds his Stryper tone in a single box³. ISP announced in February 2017 that Sweet, a long-time endorser, had signed on for the signature model¹, and the collaboration continued with the Empyrean in 2024².

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