remove references to samples in synth section

Author: samaaron

etc/doc/tutorial/02.1-Synth-Parameters:-Amp-and-Pan.md

@@ -10,19 +10,19 @@ First, let's look at what parameters actually are.
 
 ## Parameters
 
-Sonic Pi supports the notion of parameters for its synths and
-samples. Parameters are controls you pass to `play` or `sample` which
-modify and control aspects of the sound you hear. Each synth has its own
-set of parameters for finely tuning its sound. However, there are common
-sets of parameters shared by many sounds such as `amp:` and envelope
-parameters (covered in another section).
+Sonic Pi supports the notion of parameters for its synths Parameters are
+controls you pass to `play` which modify and control aspects
+of the sound you hear. Each synth has its own set of parameters for
+finely tuning its sound. However, there are common sets of parameters
+shared by many sounds such as `amp:` and envelope parameters (covered in
+another section).
 
 Parameters have two major parts, their name (the name of the control) and
 their value (the value you want to set the control at). For example, you
 might have a parameter called `cheese:` and want to set it with a value
 of `1`.
 
-Parameters are passed to calls to `play` and `sample` by using a comma
+Parameters are passed to calls to `play` by using a comma
 `,` and then the name of the param such as `amp:` (don't forget the
 colon `:`) and then a space and the value of the parameter. For example:
 

etc/doc/tutorial/02.2-Switching-Synths.md

@@ -1,10 +1,10 @@
 # Switching Synths
 
-So far we've had quite a lot of fun making beeps and playing
-samples. However, you're probably starting to get bored of the basic
-beep noise. Is that all Sonic Pi has to offer? Surely there's more to
-live coding than just playing beeps? Yes there is, and in this section
-we'll explore the exciting range of sounds that Sonic Pi has to offer.
+So far we've had quite a lot of fun making beeps. However, you're
+probably starting to get bored of the basic beep noise. Is that all
+Sonic Pi has to offer? Surely there's more to live coding than just
+playing beeps? Yes there is, and in this section we'll explore the
+exciting range of sounds that Sonic Pi has to offer.
 
 ## Synths
 

etc/doc/tutorial/02.3-Durations-with-Envelopes.md

@@ -2,8 +2,7 @@
 
 In an earlier section, we looked at how we can use the `sleep` command
 to control when to trigger our sounds. However, we haven't yet been able
-to control the duration of our sounds (except in the case of samples
-where we can stretch and compress them).
+to control the duration of our sounds.
 
 In order to give us a simple, yet powerful, means of *controlling the
 duration* of our sounds, Sonic Pi provides the notion of an *ADSR