• Guitar 2 tuning: The score specifies that the B and E (II, I) strings are retuned, -14¢. Consequently, the C# octaves from mm. 85 are quite difficult. Suggestion: tune the G string down as well, play the low C#s there.  (Thanks to Josh Lopes)
• No section III is marked, it should probably be at m. 107. (Thanks to Nick Didkovsky)
  
• The bass harmonics are difficult to produce. Suggestion: tune the bass I (G) string up to A, and the II string to D# (11th harmonic, -49¢). This makes the required pitches lower harmonics on a higher string  These strings are not otherwise used. A 6-string bass, also retuned, adds more possibilities for bringing the required pitches to lower nodes. (Thanks to Devin Maxwell).
• These notes refer to the publication of the score in New Music for Plucked Strings, Frog Peak Music.
• Excerpt from letter, JT to LP, 1985, about Septet
  

Harmonium #3 (String Trio)

• Measure before XI, cello part. Doesn't agree with score. Part has 1 triple, 3 duples. Score has 3 triples, 1 duple. Score is correct (I believe)
• at VIII, violin part should be 16ths in score (beam missing)

Harmonium #2 (guitars)

• The last measures in guitar 1 (what is now a triad starting on Eb) is wrong, it is a Gb major triad. The typo seems to be that the Gb major arpeggio is notated as if it were in the bass clef.