Tune keys not working

Hello,

I need your help in figuring out how to repair my zoom V3 Vocal Processor. The knob to change keys isn't working anymore. I had it checked and they told me that there was an issue with the potentiometer and there isn't any compatible replacements here in our country. Can anybody help me with workarounds? Thank you!

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2947414:01crwdne2947414:0:

hello everyone. any help would be appreciated

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0