Lofi,...
You may not select ANY "Buss-Assign" on ANY channel, at the same time that "STEREO-L/R" (assign) is selected. Doing so will cause a global mute, to the entire 388 monitor system,... which is a fundamental design feature that prevents an internal feedback loop from developing.
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Here's a quick rundown of recording:
1) Plug mic into Channel 1, (all other channels N/C)
2) Set Channel 1 PAN to CENTER
3) Select Channel 1 Input to MIC, (all other channels: LINE)
4) Adjust TRIM for just below "OL", while speaking or playing into the mic.
5) Set Channel 1 Fader about "7"
6) Select BUSS 1/2 (Assign)
7) MAKE SURE ASSIGN L/R IS NOT SELECTED ON ANY CHANNEL
8) Set ALL Monitor Gain pots to about "7"
9) Set ALL Monitor Pan pots to "center"
10) Set PGM-MASTERS to about "7", (both)
11) SET L/R MASTER FADER TO about "7"
12) DEPRESS REC FUNCTION 1 AND 2
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You should now see your mic-input signal registering on the VU METERS 1 AND 2, PLUS ALSO ON THE L/R-Stereo VU METERS. ADJUST, AS NECESSARY.
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13) SET the MONITOR SELECT to "Stereo L/R"
14) SET the "Phones Level" to about 3
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You may vary Channel 1's PAN, left and right, and see the corresponding change on VU METERS 1 & 2, also the STEREO-L/R VU meters.
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15) Press RESET on Tape Counter
16) Press RECORD & PLAY,... (record your phrase or jam)
17) Press STOP, RTZ
18) UNSELECT RECORD FUNCTION 1 AND 2
19) Press PLAY
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Your recorded signal should be coming off tape, through the monitor and Stereo L/R-buss, through the phones and to the Stereo L/R-Outputs on the back, as well as registering on the VU Meters 1 & 2, plus Stereo-L/R meters.
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POINT: THE MONITOR USES THE STEREO L/R BUSS AS AN OUTPUT DEVICE, AND THEREFORE, YOU MAY NOT SELECT STEREO-L/R ON THE ASSIGN SWITCHES ON EACH CHANNEL, AT THE SAME TIME YOU SEND THE SIGNAL TO THE "ASSIGN-BUSS", [Assign 1-8], WHICH ALSO USES THE MONITOR. THIS WOULD CREATE A FEEDBACK LOOP UPON ITSELF, AND THEREFORE, IS A DESIGN FACTOR OF THE 388, TO MUTE THE ENTIRE SYSTEM, TO PREVENT THIS.
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LOFI, if this step by step procedure does not get you recording, then let me know, and I'll review all details, when I have a time to sit down at the 388. This was all drawn up from memory.
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NOTE: When the REC FUNCT is depressed DOWN, the signal comes into the Monitor through the INPUTS. When the REC FUNCT is UP, the signal comes through the Monitor from the TAPE.
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NOTE2: ALL your signals, going to and fro, GO THROUGH THE MONITOR SECTION, AND THEREFORE, ALSO THROUGH THE STEREO L/R BUSS,... for most of your normal recording activities. Of course, there are other ways to set up and patch for signal routing that does not flow through the monitor section, but that's more advanced stuff, that's beyond the scope of this question.
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NOTE3: Make sure DBX is engaged on both [1-4] & [4-8], all the time, for recording and playback, alike.
I hope I haven't forgotten anything! Try this procedure, and let me know!
Thx, /DA