I need help transposing a piece for the horn. I do not play it so therefore it is very difficult getting my head around this. I originally play the violin so brass instruments are totally diff. world to me. I am writing a piece for orchestra in G minor and I have two different sections for horn - G and D horn. However the software I am using only has the F horn option. Your help transposing the piece to both G and D would be very helpful.
Unless you're purposely writing in an antique style, for players who you know possess antique instruments, write for Horn in F. The instrument is fully chromatic. The player will very likely switch freely between the Horn in F and Horn in Bb which are combined in his modern 'Double Horn'. This is not your concern. I repeat - write for Horn in F. That means notating a perfect 5th above the required piich. If you want middle C, write the G above. The convention in horn parts is not to use a key signature, just accidentals for everything. Silly, really (if the music IS tonal). But horn players cling to the tradition.
Very likely your notation software has the option of composing in concert pitch, then automatically switching to a Transposed mode where Horn in F, Clarinet in Bb etc. see the right notation. Confusion is possible :-)