Abstract: An apparatus and method for joint music production wherein a remotely separated plurality of musicians are joined by phone lines of a public telephone system. The public telephone system has a signal frequency cutoff limiting transmission to a low range which is incompatible with music. Each of musicians produces a local music signal (MSL) with full audio range. This signal is impressed on the public telephone system which creates a low-end outbound music signal (LEL). Also, separately, the MSL signal is filtered through a first high-pass filter and mixed with a mixer signal to produce a sum/difference signal (SDL). The SDL signal is impressed onto the second phone line of the public telephone system as a high-end outbound music signal (HEL). A second mixer circuit receives at least one remotely produced sum/difference signal (SDR) and the mixer signal and this is again filtered to obtain the high end signal only (HER).

Abstract: An apparatus and method for joint music production wherein a remotely separated plurality of musicians are joined by phone lines of a public telephone system. The public telephone system has a signal frequency cutoff limiting transmission to a low range which is incompatible with music. Each of musicians produces a local music signal (MSL) with full audio range. This signal is impressed on the public telephone system which creates a low-end outbound music signal (LEL). Also, separately, the MSL signal is filtered through a first high-pass filter and mixed with a mixer signal to produce a sum/difference signal (SDL). The SDL signal is impressed onto the second phone line of the public telephone system as a high-end outbound music signal (HEL). A second mixer circuit receives at least one remotely produced sum/difference signal (SDR) and the mixer signal and this is again filtered to obtain the high end signal only (HER).