I have a Segovia backpacker guitar (Segovia is a Korean company; the guitar was made in China). The problem is that it doesn't play in tune very well--especially if I play up the neck.
The strings seem to be unusually sensitive to pressure; varying finger pressure makes a huge difference in the string's pitch, especially in the bass range. And using a capo makes the guitar sound really bad.
For clarity, if I push just hard enough to avoid string buzz while fingerpicking softly, the guitar sounds OK. But if I push hard enough to avoid buzz while strumming vigorously, the strings I'm fretting go considerably out of tune.
How can I fix this problem?