Check the listing for details. Pro Tools Legacy Upgrade – 12-Month Renewal for Institutions. Condition: New. Listed at 74.99 USD. Yurei is transparent like a ghost. It will make your guitar or bass sound sharp and cutting through any music environment with the same precision of a samurai sword. Yurei is a Samurai Ghost, an amazingly useful discrete tool, a Buffer/Clean Boost, it''s a GhostBooster. Suitable for both Bass and Guitar. Can be extremely useful to revive a lowered signal due to long cables or many pedals connected in your board. Use it before or after your favorite distortion pedal, or just with your amp to get incredible tones.