Re: need help with apple MIDI audio hardware/software

[mjmahon@aol.com (Michael J. Mahon)]

Erik Swedberg replied:

>mjmahon@aol.com (Michael J. Mahon) wrote in message
>news:<20040929230140.04433.00001596@mb-m05.aol.com>...
>> Erik Swedberg wrote:
>> 
>> <snip>
>> 
>> >ALSO - different question: Has anyone got a nice homebrew way to tap
>> >the audio out signal to a mono signal? The audio jack is a weird
>> >stereo/mono thing that confuses me, and confuses all the radio shack
>> >1/8" adaptors i stick in there... i always get the best results by
>> >having to pull the 1/8" adaptor out ever so slightly -- obviously not
>> >a good live music solution. I have the IIgs hardware reference, and
>> >i've tried getting the signal from that little J-whatever molex
>> >adaptor on the motherboard, but if i remember, it was real
>> >static-y/noisy.
>> 
>> IIRC, the audio output jack is a 1/8" stereo jack with both
>> inputs connected together, i.e., mono.
>> 
>> You should be able to use a standard stereo patch cord,
>> and ignore one of the channels (since they are identical).
>> 
>> -michael
>> 
>
>Yes, an 1/8th inch stereo male jack will work correctly in the audio
>input jack, which works fine for a set of headphones, or one of those
>cables that has a stereo 1/8" jack on one end and 2 male RCA stereo
>jacks on the other end (like the ones that come with portable cd
>players so you can plug them into a stereo?). Is that cable the
>"standard stereo patch cord" you're talking about?
>
>like this: 
>http://www.computers4sure.com/comassets/productlarge/CNET/I158247.jpg
>
>you're suggesting just taking one of those signals, using adaptors
>(say from radio shack?) to go from the RCA connector to a 1/4" cable
>(like a guitar cable)? would it be ok to run that signal into a mixing
>board? would there be any weird impedance or signal strength issues?

The headphone output is a relatively low impedance output at
approximately "line" level, and should go into a mixer fine.

-michael

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