Has anyone tried this humidification/ duhumidification system called MusicSorb that does not require placing in the sound hole?
Copied below description from Stringsbymail's site:
"The Music Sorb Guitar Pack contains six 30-gram units for your guitar (a total of 180 grams or 0.4 lbs).
The Guitar Pack outer cover is re-sealable (Ziploc style) so you may, for example, use fewer packets in your instrument case in less extreme humidity conditions and then seal the rest in the pack and use the remaining units a year later. Normally, you will use the whole Music Sorb Guitar Pack to protect your guitar and become less dependent on guessing your surrounding humidity extremes. In dry geographic areas, we strongly suggest that you read about preconditioning the units.
Music Sorb is an ideal humidity control solution because you place it in your instrument case and that’s it. It doesn't need to be dipped, plugged in, or hung in a special position. You can concentrate on more important things. Just place it in your instrument case and forget it for a year.
Music Sorb has a minimum life expectancy of one year at which time it may need to be replaced depending on how hard it has worked to maintain the right humidity. (Like a rechargeable battery, it wears down. But if you have been good at keeping your case closed, it may last past a year.)
Music Sorb humidity control units “adsorb” (not “absorb”) moisture out of the air when the humidity is above 50%RH and “desorb” that same moisture when the humidity is below 50%RH. It will, thus, maintain the right humidity range of 40% RH to 60% RH in your instrument case.
Music Sorb comes in three sizes: Guitar Pack, Violin/Viola Pack, and Cello Pack. For string bass, you use one violin pack and one cello pack.
Is not a desiccant
Controls humidity in your instrument case
Adsorbs when humidity is above 50%RH
Desorbs when humidity is below 50%RH
Is not expensive
Is all natural
Lasts minimum one year
Place Music Sorb pouches in your instrument case. Keep the case closed except to remove or replace your instrument. If you live in an area with humidity below 40% RH when you open the package, you will need to pre-condition the Music Sorb units so that they have enough moisture to begin their hard work.
Music Sorb is completely safe and inert. Direct contact will not harm the instrument. If you have further questions, you will find many answers here."