I would like to learn and improve my jazz improvisation and soloing skills. Many places I am reading about the importance of singing along to improve my ear. It is completely reasonable, however I have serious problem with it: My voice is max one octave (the lower octave of the standard G major scale on guitar) so I simply can sing anything else.
Otherwise I do not think there is any problem with my ear as I can hear correctly the simple and even medium ear training exercises with no special previous serious practice.
Now it seems my voice prevents me to improve learning improvisation. I never learned to sing, so I do not know even my voice can improve or not.
Any thoughts about is this issue important or not, and if it is how to overcome?