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The 729 is a pretty old box and only accepts HDMI @ 1080i 1080p. 720i 720p 480i and 480p
Because the 729 is HDMI compliant, and HDCP compliant, you cannot display an HDMI signal on a computer monitor which will not display a content protected source.

Connect your source directly to the display, if that’s ok then try through the switcher.

Check for the latest firmware from Kramer,
You can always call their tech support team.

Kramer ProScale... | Answered on Nov 24, 2017

Without seeing your guitar, I'm going to assume the "tightening lugs" you're reffering to are the string locks on the nut. On a guitar with a "floyd rose" style tremolo system, the strings pass through a clamping system at the nut before going to the normal tuning keys. This clamping system "lugs" must be loosened then the guitar is tuned as it normally would, then the lugs are tightened to lock the strings in place. These clamps are not part of the tuning mechanism, but instead lock down the strings after they have been tuned by the keys. After all that, one would fine tune the guitar at the bridge rather than at the keys. A more complete explaination is found here-
String Tuning Instructions

Kramer Music | Answered on Feb 17, 2015

on KVM switches, blank screen means bad cable/connection, black screen means not enough power to the switch.

Kramer (VP211DS)... | Answered on Oct 14, 2013

in theory yes as it should have a dvi digital interface. so with the right hdmi to dvi cable the 719xl should work as you require. resolutions of 1600 x 1024 should be possible.

Kramer... | Answered on Feb 02, 2012

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