for a 1khz input to the jfet, use a 2uf or 10uf cap. also, i fail to see why in this day and age of op amps capable of 300Mhz or more of bandwidth (and there have been excellent audio op amps since the late 70's, that are readily available just about ANYWHERE) people continue to try to use 741's for audio. 741's are not any good above 9khz or so, they have huge amounts of input noise, and relatively large input bias currents and input offset voltages, and are (if you happen to use one without internal compensation) unstable and prone to oscillation (in the circuit you submitted above, the compensation pin is left open). while this may be a great training aid to learn the differences between an "ideal" op amp compared to a "worst-case" real-world device, it's not suitable for many applications that are filled by better types of op amps. try this circuit with a TL072 or LF353, or even better, a TLE2072 or other op amp designed for audio applications.