fix the N163 doc

doc/7-systems/n163.md

@@ -6,7 +6,7 @@ it has 256 nibbles (128 bytes) of internal RAM which is shared between channel s
 
 wavetables are variable in size and may be allocated anywhere in RAM. at least 128 nibbles (64 bytes) can be dedicated to waves, with more available if not all channels are used - waveform RAM area becomes smaller as more channels are activated, since channel registers consume 8 bytes for each channel.
 
-Namco 163 uses time-division multiplexing for its output. this means that only one channel is output per sample (like OPLL and OPN2). therefore, its sound quality gets worse as more channels are activated.
+Namco 163 uses time-division multiplexing (TDM) for its output. this means that only one channel is output per sample (like OPLL and OPN2). therefore, its sound quality gets worse as more channels are activated.
 
 ## waveform load position versus waveform position
 
@@ -41,12 +41,10 @@ if the waveform changes (e.g. ins change, wave macro or wave synth), or the **lo
 
 ## chip options
 
-- **Initial channel limit**: sets the number of channels that will be active.
-  - each additional channel reduces sound quality.
-  - each additional channel reduces available wavetable memory by 8 bytes, equivalent to a waveform length of 16.
-- **Disable hissing**: switches from multiplexing to mixing, which increases output quality but is not accurate to hardware.
+- **Initial channel limit**: sets the number of channels that will be active. higher values reduce volume and make TDM artifacts more noticeable.
+- **Disable hissing**: remove TDM artifacts by mixing. sacrifices some accuracy!
 - **Scale frequency to wave length**: automatically adjusts note frequency to account for differing waveform lengths.
-  - if disabled, note frequencies ignore waveveform length. this is FamiTracker's behavior.
+  - if disabled, note frequencies ignore waveveform length. this is how FamiTracker behaves.
 
 ## info