diff --git a/The-Enterprise.md b/The-Enterprise.md
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@@ -63,4 +63,24 @@ The unexpanded 64kb machine divides this up as:
 
 The 128kb machine adds a further four banks of RAM at F8–FB; further expansion RAM usually populates the 4mb address space downward from there.
 
-At reset all four paging registers are cleared to 0, making the first 16kb of the EXOS ROM visible in all four segments of the Z80's addressing space.
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+At reset all four paging registers are cleared to 0, making the first 16kb of the EXOS ROM visible in all four segments of the Z80's addressing space.
+
+### Audio Generation
+
+IstvánV provides detailed Hungarian notes [http://ep128.hu/Ep_Konyv/Exos.htm#242a](here). The following is a result of machine translating those via a couple of different online translators and synthesising the results.
+
+#### Sound Generators
+
+Each channel has a flip flop specifying its current state — high or low.
+
+Standard operation: a 12-bit counter counts downwards from the specified reload value at a rate of 250 kHz (on a 4 Mhz machine, if bit 1 of port BFh is clear). It is reloaded when it overflows, and:
+* if no distortion is specified, the output switches state;
+* otherwise the specified polynomial output is sampled and becomes the generator's new state.
+
+The polynomial counters run continuously at 250 kHz.
+
+If high-pass filtering is enabled, any falling edge on the linked channel's output resets this channel's state.
+
+If ring modulation is enabled, the channel's actual output is the XNOR of its output and that of the other channel.
+
+In both cases, the other channel's output is that after the application of distortion, high-pass filtering and ring modulation.
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